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CMMG Coll Butt Stock Kit, 6 Position for AR-15. This kit provides the six-position receiver extension, carbine buffer, carbine action spring, and six-position butt stock. Package contents include the CMMG 6 Pos Receiver Extension, Carbine Buffer Assembly, Carbine Action Spring, and 6 Position Butt Stock Assembly. Compatible with AR-15 rifles. Specifications: Manufacturer: CMMG; Gun Model: AR-15; Stock/Brace Material: Polymer, Aluminum; Gun Type: Rifle; Weight: 2 lb; Length: 15 in; Buffer Tube Size: Mil-Spec; Fabric/Material: Alum/Poly
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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