a. General* Inspect the rifle for general appearance, the metal parts for scratches, shiny spots, rust, and wear, and the wooden parts for condition and mutilation. Inspect heads of screws for burs. Check float of barrel (par. 45 a) and functioning of magazine spring and follower. Test complete action of rifle mechanism with clip of dummy cartridges.
b. Headspace* Headspace is determined by use of the headspace gages and field test bolt The points of wear determined by these gages are shown in figure 61.
(1) In conducting field inspections of the rifle, headspace will be tested with the L950-inch headspace gage used in conjunction with the field test bolt To make this test, proceed as follows: Insert the gage in the chamber and try closing the bolt on the gage. It should not close. CAUTION: In making the test for headspace, the bolt handle should never be forced, but rather should be ufelt" by using only the thumb, first and second fingers of the right hand on the ball of the
a o lever. This tatter procedure will prevent the use oi excessive force. If it does close, replace the bolt of the rifle with the field test bolt and try closing the field test bolt on the headspace gage. If the field test bolt does not close on the gage, a worn bolt is indicated In this case, the worn bolt will be replaced by a serviceable bolt If the field test bolt does close on the gage, a worn chamber or worn bolt locking lug seats in the receiver (fig, 61) are indicated. In this case, the rifle will be withdrawn from service and sent to an arsenal for overhaul.
(2) When rifles are being cleaned and repaired at an arsenal or depot, the 1.946- and L940-inch gages will be used The bolt should not close freely on the 1.946-inch gage and should close freely on the L940-inch gage.
c. Trigger Pull*
( 1 ) Trigger pull for rifles in service must be greater than 3 pounds but should not exceed 6 pounds. Rifles cleaned and repaired in ordnance establishments should have a minimum trigger pull of not less than 3 Vi pounds. This is to allow for wear.
(2) The inspector, in testing trigger pull of rifles in the hands of troops, should have two weights, one of 3 pounds and one of 6 pounds. Each of these weights should be provided with a wire so that the weight may be suspended from the middle of the bow of the trigger. The wire should be somewhat longer than the distance from the trigger to the butt plate and should have an L-shaped hook on the free end so that, when suspended from the trigger, the weight will hang freely when the barrel of the rifle is vertical.
(3) To test for trigger pull, cock the rifle and turn the safety to "ready" Insert the hook of the trigger weight wire over the middle of the bow of the trigger from the side of the rifle opposite the bolt handle, with the weight resting on the floor and the wire clear of the stock and trigger guard (fig. 62). Then, with the barrel of the rifle held vertically, raise the weight from the floor as gently as possible. If the 3-pound weight pulls the trigger, or if the 6-pound weight fails to pull the trigger, the rifle should be repaired in the manner described in paragraph 47 f (2). For the purpose of inspection of rifles undergoing repair by the Ordnance Department, a 3 V^-pound weight should be used instead of the 3-pound weight, because all rifles cleaned and overhauled by the Ordnance Department should have a minimum trigger pull of 3 V2 pounds.
NOTE: Present standard trigger pull test weights are designed to give weights of 3 and 5l/2 pounds. Weights should be improvised to test for 3 to 6 pounds as now required
(4) "Creep" is any movement of the trigger that can be felt by the finger after the slack is taken up and before enough pressure is applied to release the sear. Creep should be eliminated as much as possible, whenever found, as it prevents the proper squeeze of the trigger, which is essential to the proper firing of the rifle.
30. FLOOR PLATE, MAGAZINE SPRING, AND FOLLOWER GROUP.
a. Floor Plate and Follower. Inspect for burs and wear on floor plate tenons and on surface and edges of follower.
b. Magazine Spring. Check magazine spring for functioning and set and inspect for any deformation; free opening of spring C45034 is 41%2 plus or minus inches.
c* Check (magazine) follower of Rifles M1903A3 and M1903A4 as above, and for deformation. Same magazine spring is used for all models.
31. STOCK GROUP.
a* Stock. Inspect stock for deep scratches, bruises, and splits, especially at stock screws and at rear of tang lug of the receiver.
b. Upper Band Assembly (Rifles M1903 and M1903A1).
Inspect upper band for burs on bayonet stud, worn or burred screws, and damaged stacking swivel.
c. Bayonet Stud Band (Rifles M1903A3 and M1903A4).
Inspect bayonet stud band in same manner as upper band in subparagraph b, above.
d. Stacking Swivel Band Assembly (Rifles M1903A3 and M1903x44). Inspect band for deformation, burs, stripped threads in band and on screw, and security of screw in band. End of screw is expanded to prevent loss, and screw should not be removed except for repairs or replacements. Inspect swivel for deformation.
e« Lower Band Assembly, Inspect lower band for worn or burred threads on lower band screw and broken or bent lower band swiveL End of screw is expanded to prevent loss, on (Rifles M1903A3 and M1903A4), and should not be removed except for repairs or replacements.
f. Lower Band Spring. Look for loose or weak lower band spring, g. Hand Guard Assembly. Inspect hand guard for splits and missing hand guard clips.
h. Barrel Guard Assembly (Rifles M1903A3 and M1903A4).
Inspect barrel guard in same manner as hand guard in subparagraph g, above, and for retention in barrel guard ring on barrel Check barrel guard ring for deformation or burs, i. Bull Swivel Assembly. Look for broken or bent butt swivel w and burred or loose swivel screws.
j. Butt Plate Assembly. Inspect butt plate assembly for rust, burred or loose butt plate screws, tension of butt plate spring, and broken butt plate cap (or trap, Rifles M1903A3 and M1903A4).
k. Trigger Guard Group (Rifles M1903 and M1903A1).
Inspect for loose or burred guard screws, burred floor plate catch, and weak floor plate catch spring. Free length of spring B146883
is ViC inch.
1. Trigger Guard Magazine Group (Rifles M1903A3 and M1903A4). Inspect for loose or burred guard screws, loose bushings, cracks or breaks at welds, deformation, and burs. (Bushings are pressed in place and not removable.)
a. Outside Barrel. After barrel has been inspected for serviceability in accordance with paragraph 28 d, inspect the outside for rust, dents, and burs.
b. Front Sight Group (Rifles M1903 and M1903A1). Check alinement of front sight and firmness of movable stud in fixed stud and of fixed stud on barrel. Check for loose or missing front sight screw. Check front sight for shine (par. 46 b (1))-
c.m Fronl Sight Group (Rifle M1903A3). Check alinement of front sight, security of base on barrel, and security of sight and pin in base. There should be no looseness in sight or base. Key should be secure in barrel (par. 46 c). Check front sight for shine (par.
d. Rear Sight Assembly (Rifles M1903 and M1903A1). Check rear sight for excessive friction and backlash in windage screw, and for play in rear sight movable base. Check tension of rear sight base spring. Look for loose sight leaf, broken or bent rear sight slide, slide cap, or slide binding screw. Check front and rear overhanging lugs of fixed base for burs and dents.
e. Fixed Base (Rifle* M1903 and M1903A1). Check (rear sight) fixed base for security on barrel. There should be no looseness.
a. General. Inspect receiver for burs and wear on bearing surfaces in well, in locking lug channel, on locking cams and shoulders, cartridge ramp, cocking piece groove, extracting cam, and safety shoulder.
b. Cul-off Assembly. Inspect for burs, missing plunger and spring, weak spring, and loose spindle. Free length of spring B146882 is 0.412-0.044 inch. Check for shine on under side of lower portion where there is a polished surface upon which is impressed the word "ON" (par. 47 b).
c. Boll Stop Assembly- Inspect for broken or missing spring or pin. (Some Rifles M1903 and M1903A1 are without bolt stop assembly as explained in paragraph 43 i.)
d. Ejector. Inspect for burred or broken point e. Sear. Inspect for worn nose and loose sear pin. Check spring for functioning, fracture, and set Free length of spring B146886 is 0.553-0.020 inch.
f> Trigger- Inspect trigger for wear and burs on bearing and heel and check for loose trigger pin.
g. Rear Sight Assembly (Rifle M1903A3). Check security and alinement of rear sight base on receiver, and security of base screw (NOTE, par. 17 f (5)). Move windage yoke right and left by turning index knob to test smoothness of movement and positioning and tension of windage yoke plunger and spring. Move slide aperture up and down ramp of windage yoke to test security at various settings and for possible turning movement due to improper assembly or looseness of slide aperture spring (par. 18 f (2)). Test security of index knob on windage yoke screw and test screw for looseness. Press index knob to left and release to test positive action of index knob spring. Check wings of sight base and windage yoke for deformation, burs, and rust, and aperture for burs, rust, and foreign matter.
h. Mount Base (Rifle M1903A4).
(1) Check mount base for security on receiver, burs, and rust, and screws for security and staking. Check front mounting recess for wear and burs, and lateral adjusting screws for looseness and burs. (Left lateral adjusting screw should be staked firmly in place and right screw should turn smoothly without undue looseness.) Check radial grooves in sides of base, and edges of lateral adjusting screws for burs.
(2) Mount the sight to the mount base and check for looseness. There should be no up-and-down movement of the front mount ring in the base when mounted. Looseness at this point may be remedied by lightly peening the dovetailed lug on the front mount ring (pan 47 h (4)). Excessive play should be remedied by replacement of parts.
34. TELESCOPIC SIGHT GROUP (RIFLE M1903A4) (figs. 5B and 67).
a. At present the Telescopic Sight M73B1 (Weaver No. 330 C) is furnished for use with the Rifle M1903A4, as described in paragraph 3 d (3). When issued, a front and rear mount ring are attached to the sight for attaching it to the mount base assembled to the receiver of the rifle. The mount base is alined, leveled, and screwed to the receiver at manufacture and the screws staked in place. The base should not be removed nor the left lateral adjusting screw dis-
tur bed unless for adjustment or repair as explained in paragraph 54. Adjustment of the sight is explained in TM 9-270, b. Adjust the sight for zero windage and elevation as explained in TM 9-270, and mount sight to sight base on rifle- Then bore sight the rifle as explained in paragraph 54, to check alinement of mount base on receiver and sight on mount base, c. Check the front and rear mount rings for position and security on sight (fig. 8)« Check radial grooves in sides of lug on rear mount ring for burs, and dovetailed lug on front ring for wear and burs. There should be no vertical or lateral movement of the front mount ring when mounted.
d. Check sight for dents, rust, cracked, loose, or dirty lenses, loose eyepiece or locking ring. Check for broken or misalined cross hairs in reticle (should run vertical and horizontal). Check for loose screws in adjustment plate. Check for loose elevation or windage screws, worn knurling, and loose locking spring. Figure 67 shows adjustable parts of the sight
NOTE; Adjustment of cross hairs and sight tube for vertical and horizontal alinement is explained in paragraphs 56 and 58.
e. Check sight for parallax as explained in paragraph 55,
NOTE: There are no spare parts issued for replacement for telescopic sight assemblies. If sight cannot be adjusted as prescribed in this manual, it should be replaced with a new sight assembly, and the damaged sight returned to a base repair shop or factory for repair or disposal. The mount base, shims, front and rear mount rings, and their component screws may be replaced.
a. Bayonet as a Unit. Inspect bayonet as a unit for appearance and general condition, fit and positive retention on rifle, and looseness of components.
b. Blade. Inspect blade for deformation, broken or nicked point, nicked or burred blade edge, unserviceable dullness and burs. Check stud ways in handle for wear, dents, burs, and foreign matter. Check scabbard catch well for foreign matter.
c. Guard. Check guard for burs, deformation, deformed or dented barrel band, loose fit on barrel when mounted, looseness on blade, and loose or missing rivets. Check bayonet scabbard catch slot for deformation and burs.
d. Bayonet Catch. Check catch for functioning, wear of hook, free action in slot, deformation, looseness on grip screw, wear in screw hole, and for burs.
e. Scabbard Catch. Check scabbard catch for functioning, free action in well, worn or burred hook, worn knurling, looseness in bayonet catch slot, and for burs. Test spring tension. Free length of catch spring B14 7063 is 0.475-0.030 inch.
f. Grips, Check grips for cracks, dents, scoring, and protrusion over edge of blade handle. Check grip screw and escutcheons for looseness, wear, projection above grips, and for burs,
36» BAYONET Ml (figs. 11 and 60), a. Inspect as explained for Bayonet M1905 in paragraph 35.
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