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
    CA BCG

    One of the VERY few BCG's that I trust. As always, performance when it counts is the ONLY thing that matters. CA is trustworthy. It's probably the highest honor you could give a company, IMO.

  • 5

    Perfect bolt carrier. Gas key is staked well and the O-ring is in place around the extractor spring.

  • 5
    Great BCG

    Well staked, well coated, well made and tough as nails. Don't fall for those hipster BCGs that lure you in with fancy coatings and a promise to love you long time. This is all you'll need.

  • 5

    Have not had it to the range yet, but excellent finish. Looks like proper stakes on the gas key. Appears to be an incredibly made product. Centurion does a good job and customer service is excellent. Buy with confidence any time.

  • 5
    Bolt carrier group

    I took advantage of a sale price on these and picked up 2 BCGs. One is for an upcoming build and one is a spare. Haven’t used them yet but I can vouch for Centurion’s quick processing of my order and the apparent quality of the parts. I am a repeat customer and always check with Centurion when I am planning a build.

  • 5
    centurion Arms BCG

    Great quality, purchased the bcg for a rifle build. Looking forward to finishing my build.

  • 5
    High quality BCG

    Great match to their uppers

  • 5
    Bolt Carrier Group 5.56

    I haven't put these in the builds I have planned but the bolts appear to be high quality. Machine finish is excellent as is the phosphate. Carrier key is properly staked and chrome lining looks great. Bolts were shipped promptly after order was placed. Thumbs up for Centurion.