This kit contains all the necessary parts to mount your AR15, M16, M4 Pistol Lower Receiver. Pistol receiver extension (buffer tube)

• 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.

BCMGUNFIGHTER™ QD Receiver End PlateLock Nut (Castle) M4Action Spring, CarbineBuffer Assembly, Carbine (options for H, H2,H3)  This kit is compatible with your ATF compliant SigTac SB15 type pistol stabilizing brace. ***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit www.p65warnings.ca.gov.***