The Colt Buttstock Mounting Kit, A2 Rifle provides a complete set of factory components to properly mount a fixed rifle buttstock based on the classic M16A2 design. Using original Colt parts, this kit helps ensure reliable function and correct fit on compatible AR-15 and AR-308 receivers while eliminating the need to source individual pieces separately.

This A2 rifle kit is ideal for builders and armorers who want a traditional fixed stock setup for range use, training, or general-purpose rifles. By pairing your preferred A2-style buttstock with this receiver extension, buffer, spring, spacer, and screw, you can complete a clean, dependable build that reflects Colt’s long-standing reputation for quality manufacturing and consistent performance.

• Manufacturer: Colt
• Model: Colt Buttstock Mounting Kit, A2 Rifle
• Make Model Fit: AR-15 Universal; AR-308 Universal
• Buffer Tube Type: Rifle
• Receiver Extension Length: 10-1/8" (25.7 cm)
• Included Components: Receiver Extension Tube, Recoil Buffer, Buffer Spring, Buttstock Spacer, Buttstock Screw