The story on the top of Page 39 in PS 801 (Aug 19) pointed out that units are seeing cracks in the M240 gun’s channels where the buffer assembly and buttstock slide in. Cracks mean the M240 must
Check buffer housing stop for missing finish
to prevent cracks in channels.
Well, that guidance needs some clarification. Only the M240B and M240L models have this problem. The M240 uses a different buffer.
One of the main causes for M240B and M240L cracking is buffer failure, which lets the operating rod strike the back plate with full force.
You can help prevent the cracking by doing the check in Step 4b of WP 0020
in TM 9-1005-313-10 (Nov 02, w/Ch7, Aug 10). If more than 1/8 inch of the finish is missing from the buffer housing stop, the machine gun is NMC, and the hydraulic buffer assembly needs replacing.