Please Note: Due to the nature of this particular coating process, every BCG will have a unique look. Coated bolt carrier group (full auto version) for AR15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin and Mil-Spec chrome lined interior. 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. HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected). Specifications for Cryptic .308 WIN / 7.62×51 mm / 6.5 Creedmoor Bolt Carrier Group (BCG): Manufacturer: Cryptic Color: Dragon’s Breath Fabric/Material: 8620 Aircraft Quality Steel Cartridge: 7.62x51mm NATO, 6.5mm Creedmoor, .308 Winchester Gun Make: AR Platform Gun Model: M16, M4, AR-15 Weight: 17.8 oz Features of Cryptic .308 WIN / 7.62×51 mm / 6.5 Creedmoor Bolt Carrier Group (BCG) Coefficient of Friction 0.2 Hardness 3200 Vickers Max Temperature 750? F Thickness 2-3 microns Reduced Carbon Fouling Easier Cleaning Package Contents: Cryptic .308 WIN / 7.62×51 mm / 6.5 Creedmoor Bolt Carrier Group
oppressedbanana11 –
Toolcraft makes Cryptic BCGs, and Cryptic adds the magic touch. Basically, think of the mil-spec BCG with a phosphate finish, chromed interior, reliable gas seal, cleanly staked key, chromed firing pin, HPT and MPI'd bolt… all of this, but without the phosphate finish which is a pain to clean. Instead you get a non chipping, very hard finish on the outside, without compromising the chromed dimensions where it matters. This finish is slippery when dry and beyond black ice when lubed up. One easy wipe and it's good as new.On a personal note, got lucky and the part visible when the BCG is installed is a nice dark bronze color, the wacky blue green part is in the back and not visible usually. But like it says, every BCG will be different in this coating choice.