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*GOV. OVERSTOCK* AO Precision Premium Bolt Carrier Group - HPT/MPI - Phosphate / Black Nitride

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MSRP: $200.00
Sale Price: Sale Price: $72.95
$72.95
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*GOV. OVERSTOCK* AO Precision Premium Bolt Carrier Group - HPT/MPI - Phosphate / Black Nitride

This is a contract overrun special listing of your favorite BCGs! We can’t disclose which government agency this overrun came from, but rest assured that this is the same high-quality part! WHILE SUPPLIES LAST


Black Nitride Specs:

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

Phosphate Specs:

These Military surplus 158 Bolt carrier groups are manufactured by AO Precision to the exacting standards of the US Military. 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
  • 158 Carpenter 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
  • Phosphate Finish
  • Extractor Spring
  • Black Extractor Insert
  • Viton O-Ring

Mil Spec Gas Key
  • 4130 Profile Extruded Steel
  • Grade 8 Hardware
  • Properly Staked
  • Chrome 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.