by Cmmg
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This CMMG AR-15 Carbine Receiver Extension Kit is designed to provide all the core parts needed to complete your carbine-length buffer system. Constructed from aluminum with a durable hard coat anodized finish, the kit offers a 6-position adjustable receiver extension, compatible with most AR-15 carbine platform builds. Includes buffer tube, buffer, action spring, receiver end plate, and castle nut.
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$58.99
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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