Bolt Carrier Group

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Centurion Arms Bolt Carrier Group

Centurion Arms C4 Bolt Carrier Group was created with MPI tested bolts and marked to give you the ultimate confidence in your weapon system. This full auto carrier is heat treated and precision machined. The gas key is staked on both sides of both bolts.


  • Mil-spec Carpenter No. 158
  • MPI bolt (magnetic particle inspected)
  • Shot peened bolt
  • Chrome lined carrier (auto)
  • Chrome lined gas key
  • Gas key hardened to mil spec
  • Grade 8 fasteners
  • Staked gas key
  • Tool steel extractor


  • 5
    A BCG that Delivers!

    Posted by Ron Durr on Jun 11th 2019

    Placed in an upper receiver that needed some attention to detail after purchase. I found that the SRC with DLC worked the best with this upper.....until Now! Centurion Arms BCG just works, cycles smooth, looks good, and the price is awesome! Keep making affordable, high quality
    product, and i will

  • 5
    Best BCG hands down

    Posted by Jake on Jan 2nd 2019

    I have 12 of these guys in rifles and have many 10s of thousands of rounds through them. I get more life out of these bolts then I do with the BCM's and others. For 105-125 bucks for these guys, I won't even consider another BCG. Monty and Corrie are the best in the business. These folks continue to get my business. A+ all around.