The Radian Enhanced Bolt Carrier Group is manufactured from case hardened 8620 steel and has a properly staked 4130 steel gas key. The bolt is made from case hardened 9310 steel, shot peened, HPT and MPI tested to ensure reliability. The bolt carrier group is finished with a self-lubricating polished black nitride coating. The bolt lugs are CNC ground following heat treatment to insure the greatest accuracy possible.
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