Azimuth Technology is one of the largest BCG manufacturers in the industry and a military contractor. Located in Florida, their manufacturing plant is an ISO 9001:2015 certified metals machining and supply partner to hundreds of prestigious Original Equipment Manufacturers (OEMs) and the firearms aftermarket. Azimuth is ITAR Registered; EAR, US Department of State DDTC and ATF compliant; and we have also passed the rigorous DCMA audit. In addition to machining major component parts and assemblies like their world-class aftermarket drop-in barrels, slides and bolt carrier groups, Azimuth produces major OEM component parts for well-known, trusted firearms brands in the US and worldwide. Carrier Specifications Material: 8620 Steel Type: M16 Full Auto (Preferred for most AR-15 builds) Grade 8 Gas Key Screws Coating: Black Nitride Bolt Specifications Bolt Material: 9310 Steel | Shot Peened Extractor Material: 4140 Steel Caliber: 458 Socom / 450 Bushmaster Mil-Spec O-Ring Mil-Spec Gas Rings (3) Cam Pin Material: 8620 Steel Firing Pin Material: 416 Stainless Steel Other: MPI Inspected Lifetime Warranty - Limited lifetime warranty.