Chrome%20Lined%20Phosphate%20Finish%20BCG%0A%0AM16%20Auto%20Profile%20Carrier%20Machined%20from%20Aircraft%2F%20Bearing%20Quality%208620%20Steel%2C%20Properly%20Heat%20Treated%2C%20Ground%20to%20Perfection%2C%20chrome%20lined%20phosphate%20finish%0ABolt%20is%20machined%20from%20a%20single%20piece%20aircraft%2Fbearing%20quality%209310%20steel%2C%20heat%20treated%20properly%2C%20precision%20ground%2C%20Shot%20Peened%20and%20MPI%26rsquo%3Bd%2C%20phosphate%20finsh%26nbsp%3B%0AFiring%20pin%20is%20machined%20to%20the%20mil-spec%20print%20from%208740%2C%20precision%20ground%2C%20and%20chrome%20plated%0AOne%20Piece%20Billet%20Fully%20Machined%20Enhanced%20Extractor%2C%20Phosphate%20coated%20for%20Increased%20reliability%20and%20corrosion%20resistance%0APhosphate%20Cam%20Pin%0AS7%20tool%20steel%20ejector%20and%20extractor%20retaining%20pin%0A4130%20Gas%20Key%2C%20chrome%20lined%20phosphate%2C%20precision%20staked%20using%20our%20hydraulic%20staking%20machine%2C%20chrome%20lined%20phosphate%20finish%0AKAK%20Carrier%20Key%20Screws-%20T25%20drive%2C%20Grade%208%2C%20Properly%20Heat%20Treated%0A%0APhosphate%20coating%20and%20chrome%20lining%26mdash%3Bprovides%20a%20BCG%20with%20excellent%20protection%20against%20wear%20and%20corrosion%2C%20making%20it%20a%20popular%20choice%20for%20those%20seeking%20reliability%20and%20longevity%20in%20their%20firearms.%20The%20phosphate%20coating%20provides%20an%20initial%20layer%20of%20protection%2C%20while%20the%20chrome%20lining%20offers%20additional%20durability%20and%20resistance%20to%20the%20stresses%20of%20repeated%20firing.