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The AB Arms MilSpec Receiver Extension buffer tube is an aluminum buffer tube designed for AR-15s and MODX receivers and butt stock adapters. Specifications: Manufacturer American Built Arms Company; Color Black; Finish Anodized; Fabric/Material 6061-T6 Aluminum; Gun Make AR Platform; Gun Model AR-15; Gun Type Rifle; Length 7.125 in; Diameter 4.5 in. Package Contents: American Built Arms Company Buffer Tube Assembly; Castle Nut. Compatible with AR-15.
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Sign In to Set AlertThis is a bundled product that includes multiple components. The exact contents may vary - check the product description for more details.
• Complete assembly ready to use
• Multiple components included
• Value package pricing
Guide
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