The BCM AR-15 Pistol Receiver Extension Kit (brand part number BCM PISTOL RE KIT) gives you everything needed to finish an AR-15, M16, or M4 pattern pistol lower in one box. Machined from 7075-T6 aluminum and hard coat anodized per Mil-A-8625F, Type III, Class 2, the 1.2-inch outside diameter tube is sized for an ATF-compliant SigTac SB15-type pistol stabilizing brace. Bravo Company Mfg includes the receiver end plate, M4 castle nut, a carbine-length action spring, and a matching buffer, so there’s no guessing which parts you still need. It’s a straightforward, mil-spec-quality way to complete a pistol build without piecing together components from multiple sources.

Key Specifications

• Machined from 7075-T6 aluminum for a lightweight, high-strength buffer tube.
• Finished in hard coat anodizing per Mil-A-8625F, Type III, Class 2, for lasting wear resistance.
• Measures 1.2 inches in outside diameter.
• Fits AR-15, M16, and M4 pattern pistol lower receivers.
• Sized for an ATF-compliant SigTac SB15-type pistol stabilizing brace.
• Kit includes the receiver end plate and M4 castle nut needed for a complete installation.
• Includes a carbine-length action spring and buffer, so the kit is ready to install out of the box.

Frequently Asked Questions

Does this kit include everything needed to install? Yes, it includes the buffer tube, receiver end plate, M4 castle nut, carbine action spring, and buffer.

What brace does this tube fit? It’s sized for an ATF-compliant SigTac SB15-type pistol stabilizing brace.

What lowers is it compatible with? AR-15, M16, and M4 pattern pistol lower receivers.

Buy the BCM AR-15 Pistol Receiver Extension Kit

Bravo Company Mfg built this kit for AR-15 pistol builders who want mil-spec quality parts without sourcing a buffer tube, spring, buffer, and hardware separately. Everything in the box is matched and ready to install on your pistol lower. Shop more BCM parts or browse our full AR buffer system selection to complete your build. Order it from our Lubbock, Texas gun shop for fast, reliable shipping.