Bolt Carrier Group

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Centurion Arms Bolt Carrier Group

Centurion Arms C4 Bolt Carrier Group was created with HP/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
  • HP/MPI Inspected bolt
  • 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
    Quality BCG, great value

    These are a great value for a quality, reputable bolt carrier group. I actually appreciate the absence of an HP test on these as it seems HP testing only manages to decrease bolt life with little benefit to quality control. Overall a great option for a hard use rifle.

  • 5
    A BCG that Delivers!

    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

    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.