Inspection begins with the weapon disassembled in its major groups. Shiny surfaces do not mean the parts are unserviceable. The parts of the weapon and related equipment are inspected. Any broken or missing parts are repaired or replaced IAW TM 9-1005-201-10. The gunner performs preventive maintenance checks and services (PMCS) every 90 days. If the weapon has not been used in 90 days, PMCS is performed as stated in the operator's manual. If rust is seen on the weapon, perform PMCS immediately:
a. Operating Rod Group. The operating rod should not be bent, broken, or cracked. The buffer spring should not have breaks. Lug pins should protrude equally on both sides of the buffer spacer. The operating rod spring should not have kinks or separated strands or broken strands. It can have a maximum of one break on any one strand.
(2) Check the slide assembly for visible damage. Check the feed roller for spring tension when compressed and to ensure that the pivot slide is locked onto the slide assembly.
(3) Check the firing pin for straightness and cracks. Ensure the tip is completely rounded.
(4) Ensure the firing pin spring is not crushed or bent. Ensure the beveled end is not stretched.
(5) Check the sear notch on the piston assembly for signs of excessive wear or burring. Slight rotation of the piston on its housing is normal and is not cause for rejection.
b. Barrel Group. The flash suppressor should not be cracked, and it should be fastened securely. The front sight post and front sight base must not be bent, cracked, or broken. Weapons already zeroed should not be adjusted. The heat shield assembly is inspected for damage, cracks, or broken retaining clamps. The gas regulator and collar are checked for cracks or burrs. The barrel is checked for bulges, cracks, bends, obstructions, or pits in the chamber or bore. The gas plug is checked for obstructions, cracks, and bulges. The carrying handle is checked to ensure it is not cracked, broken, or
missing; that it can be folded under spring pressure to the right and left; and that it remains locked in an upright position.
c. Handguard Group. The handguard should not be cracked or broken. The retaining clip must be attached to the handguard retaining pin.
d. Buttstock and Buffer Assembly Group. The buttstock is checked for cracks, bends, or breaks; and for missing components. It is checked for linkage and tension on the buffer rod. The shoulder rest is checked to ensure it is not bent or broken and that it locks in both positions.
e. Trigger Mechanism Group. The shoulder of the sear should not show excessive wear. The safety should function properly. That is, the sear should move only slightly when the safety is on "S" and freely when the safety is on "F". The sear pin should not protrude from the trigger mechanism, because, if it does protrude, the trigger mechanism will not go back in place.
f. Gas Cylinder Group. The gas cylinder should not be cracked, bent, or broken.
g. Bipod Group. The bipod group should not be cracked, bent, or broken. The bipod legs should extend and collapse easily.
h. Receiver Group. The cover latch should work properly. All parts inside the cover assembly should move under spring tension. All spotwelds are checked for cracks. The cover assembly should remain open without support. The belt-holding pawl must be under spring tension. The receiver should not be bent or cracked. The cocking handle should slide freely within its guide and lock in its forward position. The windage and elevation knobs on the rear sight should be movable and legible. The windage scale screws should not be worn or burred.
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