tightly, turning clockwise to secure recoil plate, stock, and grip firmly together.
(2) Place grip spring washer in large coun-terbored hole in lower end of grip and seat grip spring in hole upon washer. Then grasp stock extension so that locking lug on lower bar faces downward and place upper face of lock against lower end of grip spring. Hold in position firmly and press upward on lock against spring pressure until hinge on upper (straight) bar will slip over and lie upon top of recoil plate. Still holding lock in position with regard to spring, align hole in spring and lock, and insert hinge screw spacer until flush with lower face of lock.
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VI. Final Inspection
Weapons turned in for repair may be assumed to have defects caused by use or neglect. When they were accepted as new weapons, the parts composing them were dimensionally correct and made of the proper material. Consequently, the inspection of these weapons after repair will differ from the inspection procedure used in the manufacturing plant in that attention will be directed to wearing surfaces, parts that might crack or break due to high stress or fatigue, and evidence of corrosion. These defects do not evidence themselves by uniform reduction in a given dimension but show up as a chipped edge, a partially worn surface, or an eccentric hole. A gage used in manufacturing is merely means of comparing an unknown dimension with a known one to judge whether a piece comes within tolerances. After a piece is worn through use, the change in dimension is more easily detected in many cases by comparing with adjacent surfaces; the piece in itself becomes a gage. Visual inspection, therefore, is far more applicable in these cases and gaging is limited to those dimensions that are critical and that may be advantageously measured rather than compared. Inspection of noncritical parts (parts that do not cause malfunctions) is limited to appearance and the presence of cracks or flaws. The dimensions placed on these parts (and gaging used during manufacturing) were for the sole purpose of insuring interchangeability. Even if the dimension of such parts are worn considerably below drawing tolerances, functioning and interchangeability will not be adversely affected and the parts are consequently acceptable.
Table II is a check list for inspecton of the carbines in the hands of troops and is applicable to check points of inspection for return to user and for return to stock.
cl Carbines are not to be considered unsuitable for oversea use because of lack of modification unless such modification affects the safety of personnel, is essential to the functioning of the weapon, or is prescribed by an URGENT modification work order.
b> Newly manufactured and issued materiel, which has been inspected and accepted in accordance with Department of the Army specifications, is not to be rejected except for well-grounded reasons- All such rejections must be reported immediately to higher authority.
c. Satisfactory metal finishes for weapons range from dense black to medium light gray. Certain small-arms weapons are manufactured with an unusual shade of neutral gray finish-Since this finish (gray zinc phosphate) is an accepted Department of the Army standard, these weapons are not to be rejected by inspectors or troops for this conditon- A worn surface is objectionable from the standpoint of visibility when it is capable of reflecting light, somewhat as a mirror does. No weapon is to be rejected for oversea use unless exterior parts have a distinct shine. Bright rear sights must not be permitted on weapons for oversea use. Check to see that all rear sights have a dull black or gray finish on all surfaces.
d. Wooden components must not be cracked in such a way as to interfere with their structural strength. Surface cracks, bruises, or dents which do not affect their strength should not cause rejection, e. Inspection of the barrel to determine that it meets the requirements for return to user is similar to the inspection of the barrel required for return to stock which is described in TB ORD 366.
f. Looseness and play in such components as the sight, gas cyliner, recoil plate, bolt, may be cause for rejection. In many cases, however, the importance of such defects is exaggerated. Looseness and play must be considerable to affect the accuracy of a weapon beyond its natural dispersion, All weapons, especially those that are aiut^u>aiic, muat l-i nvr play hotwoon working it - • ■■ ■ • p ... ■
components to permit them to operate in localities where sand and dust are prevalent. A weapon may be completely useless if its working parts are fitted with insufficient clearance.
g. Minor defects in metal components do not normally affect their being acceptable. Scratches and tool marks on barrels are ordinarily of no importance.
h. Inspect the functioning and operation of components as desribed.
1 Check to see that serial number on receiver is plainly visible.
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