The Bravo Company MFG AR15 Pistol Receiver Extension Kit w/Buffer Tube/Spring/Hardware includes everything you need to mount your AR15, M4 or M16 pistol lower receiver. Bravo Company MFG crafted these AR15 Buffer Tubes from hard-anodized 7075 T6 aluminum to create rugged components that are highly-resistant to corrosion and wear. This Bravo Company Complete Pistol Receiver Extension Kit works with carbine buffer and actions springs, and it is compatible with your ATF-compliant SigTac SB15 type pistol stabilizing brace. Get the Bravo Company BCM PISTOL Receiver Kit for AR15 Pistols to expand the capabilities of your firearm. Specifications for Bravo Company MFG AR15 Pistol Receiver Extension Kit w/Buffer Tube/Spring/Hardware: Manufacturer: Bravo Company MFG Finish: MIL-A-8625F Type III, Class 2 Hard Coat Anodized Fabric/Material: 7075-T6 Aluminum Gun Model: M4, M16, AR-15 Gun Type: Rifle Length: 7.25 in Weight: 2.9 oz Additional Features: This kit is compatible with your ATF compliant SigTac SB15 type pistol stabilizing brace. Included Accessories: Buffer Assembly, Carbine, Action Spring, Carbine, Lock Nut (Castle) M4, BCM GUNFIGHTER QD Receiver End Plate Condition: New Gas System Length: Pistol Length Outer Diameter: 1.2 in Features of Bravo Company MFG AR15 Pistol Receiver Extension Kit w/Buffer Tube/Spring/Hardware: Machined from 7075T6 Hard Coat Anodized per Mil-A-8625F, Type III, Class 2 1.2 outside diameter Will fit your ATF compliant SigTac SB15 type pistol stabilizing brace Works with carbine buffer and action springs Package Contents: Bravo Company MFG AR15 Pistol Receiver Extension Kit w/Buffer Tube/Spring/Hardware