by Cmmg
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The CMMG 55CA646 Receiver Extension & Stock Kit A1 Fixed Black Synthetic for AR-15. Includes a rifle buffer assembly, rifle action spring, and an A1 rifle length butt stock assembly. When paired with a suitable lower parts kit, it helps complete the lower group assembly.
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$84.96
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$83.17
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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