Bushmaster Firearms International 5.56 Bolt Carrier Group (MPI) - Full Auto Rated - Black Nitride

The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158® steel, shot peened for increased strength, includes tool steel machined extractor and ejector, Extractor Spring, SBN, and is MPI (Magnetic Particle Inspected).

Bushmaster Firearms™ Bolt Carrier group:

• -5.56 Caliber
• -M16-cut carrier
• -Properly staked gas key
• -Shot Peened
• -Bushmaster Logo
• -MPI Tested 
• -Salt Bath Nitride Finish
• -Machined 8620 Tool Steel & 9310 Steel 
• -Made in America