Sgt of Arms Bolt Carrier Group- Our carriers are tested and proven with thousands of rounds without any bolt carrier group failure. These are made from 8620 M16 style carrier that is heat treated. 9310 MPI bolt, heat treated. 4140 billet extractor. We run this carrier in all of our carbine rifles and pistol builds for customers. We have never had a call about a failure over the last 5 years.
 
8620 M16 style carrier
H&M Black Nitride finish
Properly heat treated
Final grind before plating
9310 5.56/.223 bolt
Heat treated
Shot peened
H&M Black Nitride finish
MPI
4140 billet gas key
H&M Black Nitride Finish
Properly seated with Grade 8 fasteners
Properly staked to ensure reliability
4140 Cam Pin nitride treated for wear resistance
Billet Machined Extractor
Machined from solid 4140 bar stock, heat treated and shot peened
Phosphate coated for reliable extraction
Extractor insert included
O-Ring included
Firing pin precision machined from 17-4 H-900 Stainless Steel
100% USA Made