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AR-15 6-Position Mil-spec stock assembly. Made in USA. Color options: Black (RBU6BM) and Flat Dark Earth (RBU6DM). Includes: 6-position mil-spec polymer stock, extension tube, action spring, premium recoil buffer, tear-drop ring, and castle nut.
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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