These premium 9310 Bolt carrier groups are manufactured by AO Precision to the highest standards of top tier manufacturers within the industry. AO makes these HPT / MPI BCG's for other Military contractor juggernauts, such as FN America. All bolts are rigorously inspected and are individually High Pressure Tested and then go through a Magnetic Particle Inspection.

Mil Spec Bolt
Enhanced 9310 Steel
Shot Peened
High Pressure Tested (HPT)
Magnetic Particle Inspected (MPI)

Mil Spec Carrier
8620 Aircraft Grade Steel
Full Mass M-16

Mil Spec Extractor
4140 Steel per ASTM A108, cold drawn and stress relieved BHN 187-22
Black Nitride Finish
Extractor Spring
Black Extractor Insert
Viton O-Ring

Mil Spec Gas Key
4130 Profile Extruded Steel
Grade 8 Hardware
Properly Staked
Nitride Interior

Please note: These BCG's are considered premium because of the materials used and the Military Spec requirements that are adhered to during the manufacturing process. The HPT/metallurgy equipment and processes that these go through are very hard to find and very expensive. These are battle proven (literally), but they may not be as pretty as other BCG's out there.


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