Heavier is Better || Short 308 (Part 2)
This video details the installation of a CMMG bolt tuning kit on a short-barreled .308 rifle (CMMG Mk3) to address over-gassing and ammunition selectivity issues. The kit increases the reciprocating mass of the bolt carrier, significantly reducing felt recoil when firing unsuppressed with lighter ammunition. While effective for unsuppressed use, an adjustable gas block is still recommended for reliable suppressed operation.










