Info

Item No.

Interval

Quarterly

Lower receiver and extension assembly (serviceability check)

Remove buffer (1) and action spring (2). Check buffer for cracks.

Check action spring (12) for kinks and free length. Free length should be 11 3/4 minimum to 13 1/2 maximum inches.

Remove rifle grip (3), spring (4), safety detent (5), pivot pin (6), detent (7), and spring (8). Clean and lubricate metal components (p 2-22). Also clean and lubricate pivot pin holes and spring/detent holes.

Compress helical compression spring and takedown pin detent (9) using a jeweler's screwdriver or fabricated tool depicted in appendix E (fig E-2).

Lubricate (p 2-22) helical compression spring and takedown pin detent (9) by placing one drop of lubricant on detent and lowering the buttstock assembly (10) to vertical position. Allow the lubricant to work its way around the helical compression spring and takedown pin detent (9).

Check buttstock assembly (10) components for damage.

Under the following conditions, hairline cracks (no chipped away material allowed) originating from the buttplate end of the buttstock are acceptable without repair.

a. One hairline crack, not to exceed one inch in length, per side of buttstock.

b. Two additional hairline cracks up to 1/4 inch in length, per side of buttstock.

c. A total of three cracks per side of the buttstock, originating from the buttplate end, are allowable.

Cracks in the critical area (11) at the front end of the buttstock are not acceptable.

Not Fully Mission Capable If:

SH - Replace buffer if racked.

SH - If kinked or incorrect length replace. Do not attempt to adjust spring length.

D - Replace defective/damaged components as necessary.

D - If helical compression spring will not compress, or takedown pin detent will not return to its original position, refer to page 2-41 for repair procedure.

D - Replace damaged components as necessary.

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