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:
-Properly staked gas key
-Salt Bath Nitride Finish
-Machined 8620 Tool Steel & 9310 Steel
-Made in America
⚠️WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to - https://www.P65Warnings.ca.gov