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TM 9 2702U. S R IFLE CA L. .30, M1903A4 SNIPER'S)CHARAC TERISTICS AND OP ERATION; AND US E OF TELESCOPIC SIGH T IN TRODUCTIO N

SP RINGSLID E PERTUR E

B SEWINDAGE YOKE

Figure 3 ear Sight for U S Rifle Cal. .30

1) ST OCK . Thestock is similar tothat of theM19that the pistol grip isoptional on the M1903A3, whedidnot havethe pistol grip. Some of theM1903A3 Rfront andrear stock screw pins running laterally thrportion of the stock to reinforce the trigger guardaperture inplaceof thefront and rearstock screws andto the M1903 Rifle.Front and rear stockscrews anstandard for theM1903A3 Rifle.2 ) REAR SIG HT. In thisrifle, thefolding leaf type ofixed base, usedon the M1903 and M1903A1 Riflefrom the rear end of the barrel, and arigid, wing-typis assembled to the bridge of the receiver fig. 3).sistsof a base,.windage yoke, slide aperture, spring, andknob. The range sca le, on.thewindage yoke is markgraduations, and has 50-yardadjustments. The slide amoved up anddownthisscale forvarious ranges. Turniindex knobmoves the yoke to theright or left to alloEach click represents a change of minute of anglechange of impact of inch at a range of 10 0yards. Emark onthewindagescale represents 4minutes of anin the point of impactof 4 inches at a range of 100 yard

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TM 9-2702U. S R IFLE , CAL. .30 M1903A4 SNIPER 'S )CHARACTER IST ICS AND OPERATION; AND USE OF TELESCOPIC S IGHT

(3) B AR R E L G U A R D . In this rifle, a barrel guard extending from theupper (bayonet stud) band to the front face of the receiver, takesthe place of the hand guard on the M1903 Rif le which extendedfrom the upper band to the front face of the fixed base of the rearsight mounted on the rear end of the barrel.

(4) S T A C K I N G S W I V E L B A Y O N E T S T U D B A N D A N D L O W E R B A N DA S S E M B L I E S .a) The stacking swivel is of stamped metal and secured to theforward end of the stock, just to the rear of the bayonet stud band,by the stacking swivel band. In the M1903 Rif le the stacking swivelis of round wire and pivoted to the upper band, which corresponds tothe bayonet stud band of the M1903A 3 Rif le .b) The bayonet stud band is shorter than the upper band of theM1903 Rifle, is solid on top, and has two bayonet mounting lugs onthe bottom. In the M1903 Rifle, there is an opening in the top of theupper band, and but one bayonet lug.c) The lower band swivel is a flat metal stamping pivoted in af lat lower band. The swivel in the M1903 Rif le is of round wire, andthe lower band is grooved for reinforcement. For disassembly andassembly see FM 23-10.

(5) T R I G G E R G U A R D M A G A Z I N E .a) The magazine, trigger guard, and floor plate are of stampedsheet metal staked and welded together to form a single unit andcalled the trigger guard magazine assembly. In the M1903 Rifle,the magazine and trigger guard are an integral machined piece called

the trigger guard , and the floor plate is a separate machined pieceassembled to the bottom of the magazine section of the trigger guardby means of a spring-operated catch assembled to the trigger guard.b) In the M1903 Rifle, the magazine spring is clipped to thefollower and floor plate, and the spring and follower are removedfrom the receiver together with the floor plate by disengaging the floorplate catch. In the M 1 9 03 A 3 Rifle, the magazine spring is clipped tothe follower only, which is of slightly different design than that of theM1903 Rifle, and must be removed from the top opening of themagazine. The removal and replacement of this magazine spring andfollower is easily accomplished by following the instructions outlinedin substeps c) and d) below; otherwise difficulty may be encountered.c) Removal of Follower.1 Position rifle with muzzle to left.2. Set cut-off at O N pos it ion.3 Open bolt to extreme rearward position.4 Insert nose of bullet directly in front of ejector and against

INTRODUCTIONleft side of follower r ib.5. Tip rear of follower downward and toward ththe rifle until the front left s ide of the follower emermagazine slot at the front of the receiver .

6 M o ve bolt forward slowly to disengage followerspring.CAUTION: Do not allow front end of follower to

chamber.7 O p e n bolt and remove follower and magazine sNOTE: In some instances the follower assemblyor M 1903 A1 R if le will be found in an M1903A3 R if lebetween the two followers, note that the follower fand M1903A1 is machined from a piece of solid steel apad which acts as a stop for the magazine spring, whfor the M1903A3 is formed of sheet metal. When it isfollower of the M 1 9 0 3 R i f le is being used in the M 1 9attempt should be made to disassemble the follower

the above paragraphs, as serious damage to the chambarrel will result. Instead, the trigger guard magazine be removed in order to remove the follower (subpar. d (In all other respects, followers of M 1 9 03 and M1903interchangeable. (For removal of trigger guard magasee subpar. e (5) below.)d) Installation of Follower.1 Position rifle with muzzle to the left .2 Insert small end of magazine spring under earsslide fully forward.3 Compress magazine spring against follower anand follower sidewise into magazine opening of receiend of follower toward the front and with spring towreceiver .4 Rotate follower so that rib will project upward5. Press rear end of follower down to bottom of mato insure seating of spring under ears of follower.e . U . S. Rifle, Cal. .30, M1903A4 (Sniper's) (figwas designe d for sniping and is identical with the Mdescribed in subparagraph d above, with the following(1) A telescopic sight is mounted to the top of the reof the fixed, wing-type rear sight mounted on the M 1 9 0(2) The front sight group is entirely removed fr(3) The stock is the same as that of the M 1 9 03 A 1pistol grip and the front and rear stock screws and nuts

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TM 927023U. S. R IFL E CAL. .30 M1903A4 SNIPE R'S)CHARACTERIS TICS AND OPERATION; ANDUSE OF TELESCOP IC SIG HT

straight gripandfront andrear stock pinsas in theM1903A3 Rifle (par.2dl) ).4) The bolt handle is cut away on the outside to prevent interferencewith the telescopic sight when the handle is raised to unlockthebolt.5) Due to the mount base, the magazine spring and followercannot beremoved through the top ofthe magazine asin the caseoftheM1903A3 Rifle. To remove, unscrewfront and rear guardscrews,andpulltrigger guardmagazine assembly, together with the magazinespringand follower, from the receiver. Assemble by reversingprocedure. Ifa trigger guardand floor platesimilar tothose ofthe M1903andM1903A1Riflesare assembled to the M1903A4 Rifle, themagazine springand follower can beremoved byremoving the floor plateas for theM1903 Rifle.NOTE: Be careful when removing guardscrews asthey hold thebarrel, receiver, and stockgroupstogether.

3 DTWeight ofrifle with sight(Weaver No. 330 C) mounted ..... 9.19 IbWeight ofrifle with mount base only...................................... 8.69 IbWeightof Weaver telescopic sight No. 330 C with mount ringsassembled ................................................................................ .50 IbLengthofrifleover-all............................................................. 43.40in.Length of barrel ...................................................................... 24.00in.Diameter of bore...... ....... ....................................................... 0.30in.Number ofgrooves(earlydesign).......... ........................................... 4Numberof grooves (recent design) ................................................. 2Twistof rifling,right-hand, turn in. .................................. 10.0 0 in.Maximum range ofsight (approx.) (par. 8 b).................. 125 0.00 ydGraduationofadjusting screws, A-minuteclicks........................Sightsettingwhenissued, 100-yard range (approx.), andZerowindage (par. 10) ..................................................................Weight of Cartridge, ball,Ml (approx.).............................. 420 grainsWeightof Cartridge, ball, M2 (approx.)....... ...................... 396grainsMuzzle velocity, Ball, Ml........................................... 2,647ft per secMuzzle velocity, Ball, M2............................................ 2,805 ftpersecMaximum range, Ball,Ml (approx.). 5,500 ydMaximumrange,Ball, M2 (approx.)...................................... 3,500 ydChamber pressure (approx.):

Ammunition,Ml(mean) .................................. 48,000 Ib per sq in.Ammunition, M2 (mean) .................................. 50,000Ib per sq in.Weightof 10 rifles with sight, packed in standard container(approx.) ......................................................................... 151 IbNOTE: 7,000 grainsequal pound avoirdupois measure.

INTRODUCTION4 PRECAUTIONSa The following precautions are referred toemphasis. They apply to the paragraphs indicatedgraphs should be read carefullywithprecautions in1) Donot allow frontendof followertostrikem(par. 2d 5) c)62) Individualsafetyprecautionsare aslisted in3) Do not remove the eyepiece fromthe sightenter,or thecross hairs maybe damaged Itshouldmorethan l2 inch from the all-the-way-on position(4) Donot turnthe leftlateraladjusting sc rew.staked in positionso that itwill not have to beadjusmount is installed on themountbase. Ifthe leftlaterais turned, theabove methodof attaining zero windage w(par. 10 c 2)).

(5) Parallax maybepresent in a sight at ashortor less) and not at longer ranges. In such a case, nparallax is needed if it is correct forranges used (par.6) The mount ringscrews shouldbe drawn dowholdthe sight firmlyinplace, but not tootight If sdown too tight,thesight tube maybecomebent or theelements ethrown outof adjustment (par. 12 a).

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TM 9-2705-6U. S. RIFLE CAL. .30 M1903A4 SN IPER'S )

CHARACTERISTICSANDOPERATION; AND US E OF TELESCOP IC SI T

Section IIOPERATION AND CA RE OF TH E RIFLE

ParagraphGeneralOperation of the rifle............ .....Individual safety precautions5 GENERA L.

a. The operation, care, maintenance, disassembly, and assemblyof the M1903A4 (Sniper's) Rifle is identical with that of the M1903and M1903A1 Rifles covered in FM23-10 with the following exceptions(1) The lower band assembly is removed and reinstalled asdescribed for the M1903A3 Riflein FM 23-10.

(2) The magazinespring and follower should be removedandreinstalled as described in paragraph2 e (5). When removing andreinstalling these parts thetelescopic sight should be removed fromthe mount base as described in paragraph 9 h. (The mount base isalined atmanufacture and the screws staked in and should notbe removed by usingarms.)(3) The telescopic sight is removed from, and reinstalled onthe mount base as describedin paragraph9.

It This rifle can be operatedas a single loader byplacingonecartridge directlyinto the chamber, or the magazine can be filled byremoving the five cartridges from the clip and loading them separately into the magazine. Operation of this rif le is the same as for theM1903 and M1903A1 Rifles covered in FM23-10. For convenience,operation as applied to this rifle is given in paragraph 6.6 OPE RATION OF THE RI FLE .

a. Loading Toloadthe magazine, turnthe cut-off showingON; draw the bolt fully to the rear; then insert the cartridges

singly from the hand, pressing the cartridges downwith the thumbinto themagazine until caught by the edges of the receiver. To placea roundin the chamber, close the bolt. As thebolt is closed, thetopcartridge in the magazine is pushed forward into the chamber.When the rifle is used as a single loader, cartridges are inserteddirectly into the chamber with the hand, the cut-off being turnedown

10

OPERATION AND CARE OF TH E RIFLEh. Aiming The eye should beplacedas close to

possibleand yet havea maximum field ofview thrbut not so closeas to risk injury when the rifle recis placed too close to the eyepiece the field of viewAdjust the sight and aim in accordance with instrugraph 10 .NOTE: To prevent reflected sunlight from blurrin

closing the sniper's position, a lens hood may betightly wrapping a strip of dull black paper or saround the front end ofthe sight tube,fastening the striing it out beyond the end of the tube an inch or the len s.

c. Extraction Extraction of the empty case fromby the extractor is started during the rotation of tcompleted asthe bolt is drawn to the rear.d. Ejection When the bolt is drawn fully to the

of the case strikes against the ejector point and thefrom the receiver.e Cut off. When the cut-off is up ( ON ), and ththe rear, the topcartridge in the magazine is forced uof the bolt by themagazine spring. When thecut-offthe magazine is OFF. The bolt cannot be drawn fullfront end, projecting over therear end of the upper

the latter down in the magazine belowthe action ofmagazine mechanism then remains inoperative, and tused as a single loader with the cartridges in the mareserve.

f Follower In magazine fire after the last cartfired and the bolt drawn fully to the rear, the follblocks the path ofthe bolt, thusshowing that themagFive cartridges may then beinserted to fill the magazmay be closed without reloading by first forcing theuntil it is below the path of the bolt.

g. Unloading With the cut-off up ( ON ), movward and back until no cartridges remain in thechamber.h Safety Device To set at SAFE, which canwhen the piece is cocked, turn the safety lock to ththe body ofthe telescopicsight. This locks the firingand the rifle cannot be fired To set at READY, tlock to the left.i Cocking The rifle maybe cocked either by rhandle until it strikes the leftside of the receiver an

itdown, or by pulling the cocking piece directly to t11

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U. S RIFLE, CAL . .30 M1903A4 SN IPER 'S )CHARACTERIST ICS ANDOPERATION; AND USE OF TELESCOPIC SIGHT7 INDIVIDUAL SAFETY PRECAUTIONS

a. Consider every rifle to be loadeduntil you have examined itand proved it to be unloaded. Never trust your memory as toitscondition in this respect

b. Never point the rifle at anyone you do not intend to shoot,nor in a direction where an accidental discharge may do harm.c. Always unload the rifle if it is to be left where someone elsemay handle it.d. Always point the rifle up when snapping the trigger after

examination.e. If it is desired to carry the piece cocked with a cartridge inthe chamber, the bolt mechanism should be secured by turning the

safety lock to the right.f. Under no circumstances should the firing pin be let down by

hand on a cartridge in the chamber.g. Never fire a rifle with any grease, cleaning patch, dust, dirt,mud, snow, or other obstruction inthe bore. To do so may burstthe barrel.h. Never grease or oil the ammunition or the walls of the rifle

chamber. This creates a hazardous pressure on the rifle bolt.i See that the ammunition is clean and dry. Examine all liveand dummy ammunition. Turn in all cartridges with loose bullets or

which appear to be otherwisedefective.j. Do not allow the ammunition to be exposed to the direct rays

of the sun for any length of time. This creates hazardous chamberpressures.

12

Sec t ionWEAVER TELESCO PIC SIGHT NO.

Description ................................................................Mounting and dismountingAdjustments ..............................................................Parallax adjustment ................................................Placing reticle vertical ............................................Care and cleaning ....................................................Care and cleaning in cold and hot climates.............8 DESCRIPTION

a. General. At this time the Weaver telescopic being mounted to the U. S Rifle, ca l. .30 M1903A4,in the field. A Lyman Alaskan type telescopic sigan alternate, but as details are not available it is nmanual.

h. Purpose. The purpose of this telescopic sipossible for the sniper to get a clear image of a dby means of the fine adjustments of the cross hairspossible by the adjusting mechanism, place his spoint on the target desired. The maximum usefulscopic sight is approximately 1,000 yards.

c Description(1) The Weaver telescopic sight No. 330 C

composed of a long and a short metal tube threadshort tube called the eyepiece threads onto thelong tube (sometimes called the sight barrel ) position by a locking ring also threaded onto the llens elements are assembled in the forward end along tube, and in the rear end of the eyepiece. Bypiece in which the rear lens element is mounted, thistowards or away from the forward lens elements. Tthen be locked in place by the locking ring which aBythis means, the focus of the sight can be adjusthe operator to bring the cross hairs of the sight athe target into sharp focus.(2) Two hairs crossed at right angles are moring within the long tube to the rear ofthe middle lgroup of parts is called the reticle. This ring isattand elevation screws threaded through the adjustmen

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U. S RIFLE, CAL. .30 M1903A4 SNIPER'S)CHAR AC TERIST ICS AND OPERATION; AND USE OF TELESCOPIC SIGHT

oo S J ^ o

O

O)

14

WE VERTELESCOPIC SIGHT NO. 33theoutside of the long tube to cover the assemb4 and 7). The diameter of the ring is less than thof the tube, thus it can moved up and down afor adjustment of the cross hairs (reticle) bymeanscrews. When sighting the rifle, the point of intersecthairs is laid on the point of the target to be shot aincide with the desired point ofimpact of the bullet.

(3) A knurled knob forms thehead of the elevascrews fig. 7). The outside diameter of the knobsixty '/j-minute click notches. The screws are helda click spring screwed to the adjustment plate athe click notches. The faces of the knobs are didivisions each of which represents four Vi-minustamped on theknobs indicate the direction inmust be turned to elevate thepoint of impact of thor move it to the left ( L ) for windage correctipoint of impact, or move it to the right the screwin the opposite direction to that in which the arro(4) The telescopic sight is mounted to the recby means of front and rear mount rings which fitand are clamped by screws fig . 4). The front rintwo screws and the rearring by one screw Therlug on the bottom of the front mount ring and a flmount ring for the purpose of securing theringsmount basewhich is permanently secured to the to

by screws staked in position at manufacture.(5) The mount base fig. 4) is an oblong pieceto the top of the receiver by a screw in each end. In therear end ofthe base a slot is cut which mates with tmachined on the top of the receiver bridge and towhof the M1903A3 Rifle is mounted when assembledof the front endof the base is machined on a curvof the front end of the receiver. A thin metal shithickness is placed between the mount base and thfront or rear end to level the base with regard tobore line These shims range in thickness from 0.0to 0.020 0.001 inch A front mount base screw isthe front end of the base and then into thereceiver. Tthe front end of the base and acts as a pivot. Thereafits comparatively loosely on the dovetailed lug onreceiver and can be shifted slightly from sideto side omeans the base is alined at manufacture, so that the sigwill coincide with the bore line of the rifle barrel. Ascrew is threaded through the rear end of thebase atailed lug on the receiver bridge thussecuring the rea

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TM 9-2709U. S. RIF IE, CAL. .30 M1903A4 (SN IPER S)CHARACTERISTICS AND OPERATION; AND USE OF TELESCOPIC SIGHT

RA f D 72585

Figure 6 Weaver Telescopic Sight No 33 Showingtens Caps in Pos i t ion

NOTE: It may be necessary to lift the rear end of sight slightlywhen sliding the lug of the rear mount ring onto the mount base. Donot strain.(5) When the sight is mounted, place the larger of the two leatherlens caps over the eyepiece and the smaller over the front end of thesight. Then turn the front cap, twisting the strap around the sight tubeuntil it draws the two caps snugly together. Removal is accomplishedby reversing the procedure. Figure 6 shows caps in place.

(1) Remove the lateral adjusting screw from the mount base.(2) Grasp thesightimmediately behind the front mountring, and

swing the rear (eyepiece) end of the sight out and away from the re^ceiver on the bolt handle side, until the sight is at right angles to themount base.(3) Lift the sight upward from the mount base thus disengagingthe front mount ring lug from the undercut recess in the mount base.(4) Thread in the right lateral adjusting screw to prevent losing t

c. Loose Mount Rings. The front and rear mount rings are adjusted and clamped to the sight at manufacture and should not beremoved. If these rings should become loose or detached while the

WEAVER TELESCOPIC SIGHT NO. 33sight is dismounted from the rifle, they can be asseas follows:

(1) Loosen the mount ring screw and slide the nring onto the sight tube from the front end and backment plate on the rear end of the tube. Turn the ringof the lug is on the opposite sideof the tube from thmarked UP. Then tighten the mount ring screw.(2 ) Slide the broad, front mount ring onto the silar manner until the front face of the ring is approxi

from the front end of the sight tube and the flat parallel with the flat face of the lug on the rear mounthe lug on the front ring into the undercut recess in thturn the sight as in mounting (subpar. a above).approaches the base move the sight backward or foring until the rear ring will seat squarely in position oThread in and tighten the right lateral adjusting screring in position, and then tighten thetwo mount rfront ring. Be sure the heads of the lateral adjustingin the notches in thelug on the rear mount ring beffront mount ring screws (CAUTION, par. 12).

(3) Dismount and mount the sight totest positiproperly mounted, the elevationscrew (marked Utop and the windage screw (marked L ) on the leftto the rifle.(4) Check the cross hairs to see that they are exhorizontal in the tube when mounted. If this is not tbe adjusted as described in paragraph 12.

a. Mount Base. There is no adjustment of thealined, screwed to the receiver, and the screws areIt should not be removed.

(1) Loosen the locking ring by turning it clock(2) Look through the telescope at an object nyards distant.(3) Turn the eyepiece counterclockwise until thquite blurred. Then turn the eyepiece clockwise unare in sharp focuswith respect to the image of the(4) Hold the eyepiece and screw the locking rCAUTION: Do not remove the eyepiece fromdust may enter and the cross hairs may be damagbe unscrewed more than V 4 inch from the all-the-

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TM 9-27010U. S. RIFLE, C A L . .30 M1903A4 (SN IPER S )CHARACTERISTICS AND OPERATION; AND USE OF TELESCOPIC S I GH T

R A P D 71483

F igure 7 Weaver Telescopic Sight No 330 C howing Adjustments(fig. 7).

(1) Adjust the sight for zero windage as follows:Turn the windage screw (marked L ) (as indi

cated by arrow) as far as it will go.Turn it counterc/ocfcw/se until the index points to 0 on

the windage screw and continue to turn it two complete turns.(2) The windage screw can then be turned clockwise or coun

terclockwise for variations in windage. When the screw is turned,each click represents minute, or shift of the point of impact ofthe bullet on the target of Vi inch for each 100 yards. For example:One click will shift the point of impact of the bullet Vi inch at 100yards; J/2 inch at 200 yards; inch at 300 yards, etc. Turning thewindage screw in the direction indicated by the arrow on the screwwill shift the point of impact of the bullet to the left; turning it inthe opposite direction will shift the point of impact to the right

CAUTION: Do not turn the left lateral adjusting screw. It is permanently staked in position so that it will not have to be adjustedeach time the mount is installed on the mount base. If the left lateraladjusting screw is turned, the above method of obtaining zero windage will not be correct.

20

W E A V E R TELESCOPIC SIGHT NO. 330

(1) Adjust the elevation screw for 1 0 0 yards rTurn the elevation screw (marked UP ) dicated by arrow),as far as it will go.Turn it counterc/oc/cwise until the index poielevation screw and then continue to turn it four comis the approximate setting for 1 0 0 yards range.To obtain the exact setting, it is necessary to

at 1 0 0 yards by actual firing; that is, find the settsuch that the average point of impact coincides wat 1 0 0 yards. (See FM 23-10 for zeroing-in of rifles.)(2) The elevation screw can then be turned clocgreater than 1 0 0 yards. Each click represents Vi-mangle of elevation or a shift of V i inch on the targyards. Turning the elevation screw in the directionthe screw will shift the point of impact of the bulling the screw in the .opposite direction will shift theof the bullet downward.

(1) The firing table below gives approximate svarious ranges up to 1,000 yards. This firing table doaccount such factors as direction and velocity of wrain, etc.; consequently the values are not absolute. serve as a guide in finding sight settings after rangesmated. If the bullet does not hit the target, readjust

FIR ING TABLE FOR WEAVER TELESCOPIC S IGHT NO.

t

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U. S RIFLE , CAl. .30 M1903A4 (SNIPER S)CHARACTERIST ICS ANDOP ERATION; AND USE OF TE L ESCOPIC SIG HT

EXAMPLE: Assuming the bullets are striking4 inches to theright and 2 incheslow at a 200-yardrange, turn the windage screw8 clicks in the direction of the arrow and turn the elevation screw 4clicks in the direction of'the arrow. If the bulletsare striking; to theleftand high, turn the screws in the opposite direction.

(2 ) simple methodfor usingthe M1903A4 Rifle is to/target thee atsome intermediate range such at 200, 250, or 300 yards andset the sight for this range. Then hold over the desired point of impactof the bullet at longer ranges and for shorter ranges. The amountof or is determined by practice.

a. The parallax of this telescopic sight is adjusted by movement ofthe reticle attached to the adjustment plate on the sight. Parallax isadjusted at manufacture and the plate screwed firmly in place, andunder no circumstances should the platebe moved byusing arms,northe screws be allowed to become loose. If parallax develops, it willcause the reticle (cross hairs) to become blurred with respect to thetarget image. (This has noconnection with the eyepiece or blurringof the target imagedueto improper adjustmentof the eyepieceforfocus.)

h. Totest for parallax, place the sight on a rigid supportwith thereticle(cross hairs) alined on some mark. While looking through thesight, movethe head fromside to side. If there is any apparent movement betweenthe reticleand the mark, parallax ispresent. Correctionfor parallax may be made by ordnancemaintenancepersonnel only.

CAUTION: Parallax may bepresentin a sight at a short range (25yards or less) and not at longer ranges. In such a case, nocorrectionfor parallax is needed if it is correct for ranges used.

a. Ifthereticle should become shifted so that the crosshairs arenot exactly vertical and horizontal, they may be so positioned bylooseningthe front and rearmount ring screws, turning the sight inthemount rings, and then tightening the scr ews. If it is not possible toadjust thehairs sufficiently inthis manner, inform the responsibleordnance service.

CAUTION: The mount ringscrews should be drawndownsuffi-cieritly to holdthe sight firmly in place, but not too tight If screws aredrawn down too tight, the sight tubemay becomebentorthe reticleand lenselements be thrown out of adjustment.

22

WEAVER TELESCOPIC SIGHT NO. 330

a. General. TheU. S. Rifle, cal .30, M1903A4telescopic sight No. 330 C is issued tousing arms wmounted fromthebase.The front and rear mount ringthe sight and leather lens caps coverthefront andreafor protection. The mount base is staked in position otherifle at manufacture, andtheleft lateral adjustingthebase. Using arm personnel are required to mounrifleas explained inparagraph 9.

(1) This telescopic sight isa delicate instrumenhandled with care at all times, whether mounted orit be damaged or knockedout of adjustment. Thesibe disassembled by using arm personnel nor the eyThe locking ring should be kept turned uptight agatoprevent it from workingloose, and the mount baring screws, the adjustment plate attaching screws, anadjusting screw, should be checkedoccasionally to mtight. The leather lens caps should be kept in placewhen the rifle is not in actual use, in order to protekeep outdust and moisture. Thelenses should neverthe fin gers, as grease or acid fromperspiration will inj

(2 ) The sight shouldnever be allowed to remainnor the sun's rays to shine on the lenses when in use. Dsunor excessive heat willdamage the lens elements.sun for a considerable period through necessity, thecompletely covered.

(3) If the locking ring is tight against the eyepieclens caps in position, moisture should not be able to pinterior of the sight. When the rifle is carried in thshouldbe drained out often, or the lower capremoveulated water doesnot penetrate thelens mounting. Aering should be used under such circumstances, when

(4) Incase of gas or chemical attack, cover theFor defense against chemicalattack, referto FM21-40according toinstructions contained inTM 3-220, Ctamination MaterialsandEquipment

c. Cleaning. Cleaningshould be done with great is a delicate mechanism.(1) TU BE. The outside of the tube maybe clwiping with a clean dry lintless wiping cloth, toremoure. When thoroughly cleaned, avery coating ofpreservative, light, may beapplied to prevent rusting

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TM 9 27013 14

U. S RIFLE, CA L. .30 M1903A4 (S NIPER S)CHARACTERISTICS AND OPERATION; AND USE OF TELESCOPIC SIGHTbe taken to see that no oil touches the front or rear lenses. Toapply this oil, saturate a PATCH, cotton, gun cleaning, with the oil,thoroughly wring out the patch, and rub it over the metal surface of thesight Do not drop oil on the adjusting screws as it may work down thethreads into the tube. Never remove the eyepiece nor attempt to cleanthe inside of the tube. The cross hairs are very fragile, and if brokenthe sight is useless.

2) L E N S E STo obtain satisfactory vision, it is necessary that the exposedsurfaces of the lenses be kept clean and dry. Under no conditions willpolishing liquids, pastes, or abrasives be used to polish lenses. Careshould be taken not to scratch the lenses.When in the field, lenses may be cleaned of dust by first blowing upon them to remove the loose particles, then wiping themcleanand dry with a soft clean lintless cotton wiping cloth. If PAPER, lens,tissue, is available it should be used instead of the cloth. Lenses shouldnever be wiped with the finger or a soiled cloth, and great care shouldbe used to keep the lenses free of oil and grease. If oil or grease shouldget on the lenses, they may be cleaned off with a light application ofALCOHOL, ethyl, applied by PAPER, lens, tissue. Care must be takento see that the alcohol does not run between the lens and the lensmounting. To avoid this, point len s down when applying alcohol.Instructions for proper care of optical glass are contained in

TM 9-850.(3) Care and cleaning in cold and hot climates is explained inparagraph 14 .1 4 C RE ND CLEANING IN OLD NDHOT CLIMATES

a. Cold Climates. In cold climates, where the rifle is brought froma coldtemperature into a warm room, moisture may condense on thelenses. Such condensation may also occur when the temperature of thesight is lower than that of the surrounding air. This moisture, if notexcessive, can be removed by placing the sight in a warm, dry place.Heat from stronglyconcentrated sources should not be applied directly,as it may cause unequal expansion of parts which may result in breakage of optical parts or inaccuracies in the sight A very light coat ofoil may be applied to the exterior of the tube, using the proper precautions with regard to the lenses as prescribed in paragraph 13 c.(1) In hot climates specialcare should be used to keep the sightout of direct sunlight as excessive heat may injure the lenses or putthe sight out of adjustment due to expansion of the metal parts. Whereexcessive humidity is pre sent the sight should be inspected daily for

WEAVER TELESCOPIC SIGHT NO. 33rust However, oilinggetting on the lenses or seeping into the interior of t

(2 ) In hot dry climates where sand and dust arestorms occur, the sight and receiver of the rifle sh oucovered with a cloth or similar covering to keep oUnder such conditions all oil should be wiped fromcollect dust and sand. As perspiration from the hanrusting due to its acidity the metal parts of the sighdry with a clean dry wiping cloth as oftenas necessbe cleaned only when necessary and great care shouand sand will act as an abrasive and scratch the lenssand from the len ses and do not wipe them more thNOTE: Care and cleaning of the rifle under unucovered in FM 23-10.

25

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U. S. RIFLE, C L .30 M1903A4 (SN IPER S )CHARACTER ISTICS AND OPERATION; ND US E OF TELESCOPIC SIGHT

Sec t ion IVREFERENCES

ParagraphStandard nomenclature lists ....................................................... 15Explanatory publications ............................................................ 16Firing tables ................................................................................ 1715 .

Cleaning, preserving and lubricating materials;recoil fluids, special oils and miscellaneous related items ........................................................Soldering, brazing and welding materials, gasesand related items ..............................................

Ammunition, rifle, carbine, and automatic gun.......Firing tables and trajectory charts.......................

SN K l

SN K 2

SN T lSN F 69

SN T 5

SN B

Packing materials used by field service for smallarms service ammunition ..................................Rifles, U. S. cal. .30 M1903, M1903A1, M1903A3,andM1903A4 (Sniper s) ..................................

Tools, maintenance, for repair of small and handarms, and pyrotechnic projectors...................... SNL B-20Truck, small arms repair, Ml................................ SNL G-72Truck, small arms repair, M7 and M7A1.............. SNL G-138Current Standard Nomenclature Lists are as tabulated here. An up-to-date list of SNL s ismaintained as the Ordnance Publications forSupply Index , now published in........................ OFSB 1- 1

Ammunition, general.............................................. TM 9 1900Qualifications in arms and ammunition trainingallowances .......................................................... AR 775-10

26

REFERENCESSmall arms ammunition.................................Small arms ammunition ................................ ....

Cleaning, preserving, lubricating, and weldingterials and similar items of issue by thenance Department ...................................General lubrication instructions, small arms

May 1943) ................................................Chemical decontamination materials and ement ..........................................................Defense against chemical attack ..................Military chemistry and chemical agents........

U. S. Rifle, caliber 30, M1903.........................Ordnance maintenance: Rifles, U. S. Cal.M1903 and M1903A1 ............................

Inspection of ordnance materiel ..................Maintenance of materiel in the hands of trooMaintenance: Serviceability standards (1-29

f. Instruction guide: Small arms accidents, malftions, and their causes ...............................g. Instruction guide: Small arms data ..............h. Ordnance field service in time of peace.........i. Range regulations for firing ammunition for tr

ing and target practice ..............................j. Targets, target materials, and rifle range constion .............................................................

Firing tables for Gun, machine, caL .30 Broing M1917-Gun, machine, cal. 30, Broing, M1919A4 and M2 (heavy barrel) FiCartridge, ball, cal. 30, M1906Cartriball, caL 30, M2 .....................................

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TM 9 270U. S. RIFLE CAL. .30 M1903A4 (SNIPER S)CHARACTERISTICS AND OPERATION; AND USE OF TELESCOPIC SIGHT

INDEX

Adjustments:

No. 330 C.............. ................ 19-22B

Barrel guard, description .................... 6Bayonet stud band, description.......... 6

Cleaning Weaver telescopic sightNo. 330 C...................................... 23-24

Cocking the rifle....................................

Description of Weaver telescopicsight No. 330 C.............................. 14-17

Differences among models of riflesDismounting telescopic sight........ 8 9

Elevation adjustment .......................... 21

Follower

M Page No.Magazine, loading................................ 10Mount base, adjustment...................... 19Mounting telescopic sight.............. 17-18

Operation and care of rifle............ 10-11individual safety precautions........ 12P

Parallax, adjustment for...................... 22Precautions in care of rifles................ 9

Reticle, placing vertical...................... 22Rifles, U. S., cal. .30 M1903,M1903A1, M1903A3, and M1903A4,differences among models................ 2 8

Safety precautions ................. ............. 12Stacking swivel ..................... ............... 6Stock, description ............................. ... S

Trigger guard magazine,description ........................................ 6-7

Unloading the rifle........................... ..... 11

Weaver telescopic sight No. 330 Cadjustments ................................ 19-22care and cleaning.....;...;.............. 23-24

in coldand hot climates........ 24-25description .................................. 4 7mounting and dismounting........ 17-19

placing reticle vertical...................... 22

6 Zero windage adjustment..28

20

IND EX

A.G. 300.7 6 Jul 43)O.O. 300.5/3793 8 Jul 43)G. C. M

OFFICIAL:J. A. ULIO,

DISTRIBUTION: R 9(4); Bn 9(2); C 9(8); 1C 2 andFor explanation of symbols, see FM

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NOTES

30

C H A N G E S WA RNo. 1 J W A S H I N G TON 2TM 9-270, 28 September1943 , is chang ed as f

2. DIFFERENCES AMONG MODELS.d.. TJ. S. Rifle, Cal. .30, M1903A3 fig. 2).

4) S T A C K I N G S W I V E L , B A Y O N E T S T U D BA N DA S S E M B L IE S .The stacking swivel is of stamped sheet mto thestackingswivel band by the stacking sassemblyis mounted on the forward endoth rear of the bayonet stud band. In the M1 903Rifle.

e. TJ. S. Rifle, Cal. .30, M1903A4 (Sniper'5) Due to the for th M 1 90 3 R ifront and rear guard screws should be remonly when necessary. They shouldbe kepsible at all times and therifleman shouldquently. After tightening or replacing grifle should be zeroed. (See par. lOd (1)

1 7 NO T 43).] C 1, 4 Mar 44. )7. INDIVIDUAL SAFETY PRECAUTIONS

e. f it is desired to carry the piece coc ked wichamber, turnthe safetylock to the right.. Added.) Never use a bayonet with M

th telesc opic sightis mounted on it.9. MOUNTING ANDDISMOUNTING.

c. LooseMount Rings.*(1) Lo ose n tie mount ring screw and slide theringon to the sight tube -from the front and b

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OTS

1 U. 8. J8IPLBagainst, the adjustment plate on the rear end oring mount ring screw.

2) A simple method for using the M1903A4rifle atsome intermediate range such as 200, 2any other range that seems desirable and range. Then hold de termined byC

b. Superseded.) To test for parallax 1) Place the sight on a rigid support, focusthe reticle on a mark about 100 yards distant. 2) While looking throughthe sight, movethside f there isan y apparent movement betweenmark, parallax present. orrection for parallordnancemaintenance personne l only

G. C. MOFF IOIAI ,:

A . ULIO,

T ~ ? - MMiiifpBiii.f