CFD-15 SP4 Coated Bolt Carrier Group Coated bolt carrier group (full auto version) (semi-auto also available) for AR15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin and Mil-Spec chrome lined interior. CFD-15 BCG includes the proper chrome lined and heat treated gas key. Gas key is secured to carrier with Grade 8 fasteners and properly staked per Mil-Specs. This ensures a strong staking and proper gas system functioning. The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158® steel and shot peened for increased strength per Mil-Spec; includes tool steel extractor with spring and viton O-ring; firing pin chromed finished with firing pin retaining pin and cam pin. Carolinas First Defense CFD-15 SP4 Coated BCG is designed to provide reduced friction coefficient that not only lowers operating temperatures but also increases overall performance as well as the Bolt Carrier Groups life. Back by a lifetime guarantee, we are confident that our coated BCGs will increase lubricity and wear resistance while providing a smoother recoil, improved consistency, faster cyclic rates and reduce carbon fouling. SP4 Coating on the following parts: Bolt Carrier, Carrier Key, Cam Pin, Firing Pin, Bolt, Extractor Please visit our website for more information and to be put onto the waiting list: https://www.carolinasfirstdefense.com/CFD15-Coated-Bolt-Carrier-Group_p_42774.html #ar15 #slick #cfd15 #bolts #coated #slickasglass #pewpew #rifle #blackrifle #blackriflesmatter #blackriflebuilder (at Carolinas First Defense)