Product Description
Specifications: 100% Mil-Spec 5.56mm / 300 Blockout Bolt: Carpenter 158, MARKED "M" for HPT & MPI Lot tested. Carrier: 8620 Full-auto M16 cut Chrome Lined Gas Key & Carrier Phosphate Finish Dry Film Cam Pin Firing Pin: 17-4 Stainless Steel, heat treated, chrome plated 100% Made in the USA