Centurion Arms C4 Bolt Carrier Group was created with HP/MPI tested bolts and marked to give you the ultimate confidence in your weapon system. This full auto carrier is heat treated and precision machined. The gas key is staked on both sides of both bolts.
Specs:
Mil-spec Carpenter No. 158
HP/MPI Inspected bolt
Shot peened bolt
Chrome lined carrier (auto)
Chrome lined gas key
Gas key hardened to mil spec
Grade 8 fasteners
Staked gas key
Tool steel extractor