The SIONICS Bolt Carrier Group – Auto Version – for your AR15  Parkerized Exterior and Chrome Lined inside the Carrier. Machined to USGI specifications. This M16/M4 Carrier includes the proper Mil-Spec Gas Key. The Gas Key is Chrome Lined and Heat Treated per USGI specifications. The Gas Key is secured to the Carrier via OCKS (Optimized Carrier Key Screw and properly staked using a MOMOAKS. These properly hardened parts insure a strong staking and proper Gas System functioning. Furthermore, each carrier has a gasket formed by aviation Permatex that is applied by hand to the mating surfaces between the gas key and the carrier.

The Bolt Assembly is machined from Mil-Spec Carpenter No. 158® Steel, Shot Peened for increased strength and includes Tool Steel machined Extractor and Ejector, HD Sprinco Extractor Spring and is High Pressure Tested and Magnetic Particle Inspected. Now including the SIONICS Logo Engraved on the Right Side of the Carrier

Features:

• Mil-spec Carpenter No. 158® Steel
• HPT Bolt – High Pressure Tested / Proof
• MPI Bolt – Magnetic Particle Inspected
• Shot Peened Bolt
• Chrome Lined Carrier – Auto
• Chrome Lined Gas Key
• Gas Key Hardened to USGI Specifications
• OCKS (Optimized Carrier Key Screw)
• Key Staked properly using a MOMOAKS.
• Tool Steel Extractor
• Sprinco Heavy Duty Extractor Spring
• Black Extractor Insert
• Machined to USGI Specification