AO Precision

Mil-Spec M16 Bolt Carrier Group (BCG)

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  • BLACK RIFLE DEPOT Mil-Spec M16 Bolt Carrier Group BCG
  • BLACK RIFLE DEPOT Mil-Spec M16 Bolt Carrier Group BCG
MSRP: $159.95
Now: $79.95
Was: $99.95
— You save $80.00




AO Precision Mil-Spec M16 Bolt Carrier Group (BCG)

The AO Precision AR 15 Bolt Carrier Group is a true Mil-Spec BCG. The Bolt is manufactured from 158 carpenters steel and features a Manganese Phosphate Finish. Not only is each bolt carrier MPI inspected they also are individually test fired for quality assurance and reliability. Remember that Black Rifle Depot is your online shop for all of your AR 15 replacement parts, spare AR 15 parts, AR 15 upgrades, and other high quality AR 15 Parts because everyone wants a place to score cheap AR 15 parts.


  • Machined from Carpenter Technology No. 158 alloy.
  • Heat treated
  • Shot peened per ASTM B851/SAE AMS2430S
  • Individually High Pressure Tested (test fired)
  • HP proof testing, 100% using a high pressure M197 or SAAMI commercial equivalent, without evidence of failure
  • Individually Magnetic Particle Inspected after Initial Test Fire
  • Manganese Phosphate Finish


  • 4140 Steel per ASTM A108, cold drawn and stress relieved BHN 187-22
  • Manganese Phosphate Finish
  • Extractor Spring
  • Black Extractor Insert
  • Viton O-Ring


  • Machined from AISI 8620 aircraft quality alloy per ASTM A108/A322-13
  • Full Mass M16 Profile
  • Stress Relieved
  • Hard Chrome Bore

Gas Key

  • Machined from 4130 chromoly steel alloy per ASTM A108/A322-13
  • Grade 8 Hardware
  • Properly Staked
  • Hard Chrome Internal
  • Permatex sealed
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Warranty Information

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1 Review

  • 5
    MilSpec AR15 BCG

    Posted by Chapie on Nov 11th 2023

    Works very well. Fits perfect. I will buy another!

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