VKTR Industries Complete Piston Bolt Carrier Group Combat Match Bolt ID OD Hard Chrome Carrier. 5 degrees thus correctly timing the locking and unlocking allowing an additional 2 degrees of dwell time reducing residual chamber pressures and ensuring no contact between the cam pin and receiver wall. Paired with the VKTR Combat Match Bolt for uncompromising performance and durability. The carrier is finished in thin dense chrome for ease of cleaning long term wear resistance and lubricity. The patented enhanced cam pin is engraved with a directional arrow for consistent lock up shot after shot. Match performance right out of the gate. Features of VKTR Industries Complete Piston Bolt Carrier Group Combat Match Bolt Precision Cam Pin A Precision Cam Pin with enhanced dimensions and tighter tolerances over the standard part improving shot-to-shot consistency in AR pattern weapons. Features a head design that avoids contact with the upper receiver sidewall yet fully maintains bolt control and stability. COMBAT MATCH BOLT Fully-supported bolt face with no undercuts to the root of the bolt lugs adjacent to the extractor cut out turned and ground between centers for absolute concentricity 8percent wider lugs than the middle of mil spec tolerances and double shot-peened surface treatment. Package Contents: VKTR Industries Complete Piston Bolt Carrier Group Combat Match Bolt VKTR Industries V-2009-0719-003-RP: Complete Piston Bolt Carrier Group Combat Match Bolt ID OD Hard Chrome Carrier