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The CMMG A1 Rifle Length Receiver Extension is a rifle-length buffer tube designed to accept fixed rifle stocks, compatible with AR-15 and LR-308 pattern lower receivers. Constructed from black anodized aluminum. The CMMG A1 receiver extension (buffer tube) is designed to accept fixed rifle length stocks and is compatible with Mk4 AR-15 and Mk3 LR-308 lower receivers.
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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