The UTG PRO AR-15 Pistol Receiver Extension Buffer Tube is precision machined from 7075-T6 Aircraft Grade Aluminum and features a durable Type III Class II Hard Coat Anodized matte black finish.UTG PRO AR-15 Pistol Receiver Extension Buffer Tube1.2" Outside Diameter for proper fitPrecision machined from 7075-T6 Aircraft Grade AluminumType III Class II Hard Coat Anodized matte black finishInterior dry film lube coating for smoother cyclingCompatible with standard AR15 carbine type buffers and springs (sold separately)Designed and manufactured in the USAEssential for AR-15 pistol builds this buffer tube provides reliable performance and enhanced cycling with its specialized interior coating and precision engineering.