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Built to military specifications, the M4 style stock is simple, lightweight, and extremely rugged. Designed to work with Mk4(AR-15) and Mk3(LR-308) with mil-spec Carbine length buffer tubes, as well as our Fastback Buffer Tube for rapid deployment. CMMG also offers Carbine Buffer Tube and Stock Kits for Mk4 and Mk3 platforms. All CMMG products are backed by our Lifetime Quality Guarantee.
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A comprehensive overview of every major component in an AR-15 build—including what's inside bolt carrier groups and parts kits—organized by assembly for new builders.
12 min read
Guide
A neutral overview of AR-15 buffer systems, covering carbine vs. rifle receiver extensions, buffer weights, springs, and how these parts affect cycling and recoil.
5 min read