Description

AO Precision Premium Mil-Spec Phosphate Bolt Carrier Group - 158 HPT/MPI BCG
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.

Explore more Aero Precision Bolt Carriers gun parts.

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Comments (14)

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No 7.62x39 bcgs on RTB?! Damn cant find one anywhere... Anyone know where to find one?

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These are my preferred. Bought three about a year ago... since then their cost has shot up almost as fast as bitcoin has...

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Running this is a 300 Blackout carbine. Works very well and very good quality. I’m a fan.

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I have 2 of these... great BCGs .... when I do a build this is the BCG I prefer.... just out of stock a lot... always seems when I have extra cash they are out of stock

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63 bucks 2 days ago

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130 now. $70 doesn’t seem so bad now.

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What’s with the snotty reply?

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Is AO supposed to be AERO?

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Really are a moron, aren't you son???

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AGAIN with the SON stuff..........You Roy Moore Voters and your Pedophile fantasies don't belong here, back to your candy truck.

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...and this coming from a Commie-Hillary d1ck sucker. Better to 'have' a candy truck than to be a 'candy', boy. Try using google once in a while, son.

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Actually your FIVE TIME DRAFT DODGING COWARD Trump is sucking PUTIN COCK......Now back to your Pedophile Fantasies SON!

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