Milspec Carpenter No. 158® steel bolt
Chrome Lined Carrier (AUTO profile)
Chrome Lined Gas Key
Gas Key Hardened to USGI Specifications
Gas Key Grade 8 Hardened Fasteners
Gas Key Staked
Tool Steel Extractor
5.56mm Full-auto profile Bolt Carrier Group
For AR15 and M16 rifles and carbines. Made by a mil-spec contractor, these feature a Carpenter 158 Bolt, and a full profile chrome lined carrier.
Bolt is made of shot-peened, Mil-spec Carpenter 158® steel. Gas key is secured with grade 8 fasteners and staked. Bolt carrier is parkerized outside and chrome lined inside.
Bolt is not marked.