• .458 SOCOM/.450 Bushmaster bolt carrier groups (BCGs) are Magnetic Particle Inspected(MPI) to ensure high performance.
• .458/.450 BCG is made with durable 9310 Steel and compatible with both 450 Bushmaster and .458SOCOM uppers; the gas key is also staked from the side for enhanced durability.

Includes Bolt, Bolt Carrier, Extractor Pin, Firing Pin, and Cam Pin.

Specifications:
Caliber/ Gauge: .450/ .458 Carrier
Style: M16
Platform: AR15
Carrier: 8620 Steel
Bolt Finish: Parkerized
Bolt Material: 9310 Steel Carrier
Finish:Black Nitride
4140 Gas Key: Staked
Magnetic Particle Inspection:Yes