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UTG Pro AR-15 Receiver Extension Tube is Mil-Spec, CNC-machined from 6061-T6 aluminum, and finished with a matte black Type III Class II hard coat anodized finish. Designed for AR-15 carbines using carbine buffers and springs and collapsible stocks. Six-position receiver extension for AR-15 carbine platforms.
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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