Smith & Wesson® Heavy Bolt Carrier Group. For AR15 and M16 rifles and carbines. Made by a mil-spec contractor,
these feature a MPI Carpenter 158 Bolt, and a full profile chrome lined
carrier.Bolt is made of MPI Mil-spec Carpenter 158® steel.
Gas key is secured with grade 8 fasteners and staked. Bolt carrier is
parkerized outside and chrome lined inside.
- MP-4 enhanced extractor
- Stamped bolt with black extractor insert
- O-ring and heavy spring made from Microbest
- Shot peened carpenter 158 bolt
- Magnesium phosphate coated
- MPI stamped bolt
- 8620 carrier
- R420 stainless flash-chromed firing pin
- Fully staked
- All Smith & Wesson Bolt Carrier Groups are test fired for cycle function and performance
- Microbest USA made.