MPI Nickel Boron AR-15 5.56 Bolt Carrier Group (BCG)

7 customer reviews


In stock


MPI Nickel Boron AR-15 5.56 Bolt Carrier Group (BCG)


  • .223/5.56 NATO
  • Nickel boron finish
  • M16 cut
  • 9310 steel carrier
  • Carpenter 158 steel bolt
  • 4140 steel extractor
  • MIL-SPEC O-ring
  • MIL-SPEC gas rings
  • 4140 steel cam pin
  • 8740 steel firing pin with hard chrome finish
  • Magnetic particle inspected
  • Proudly made in the U.S.A.

Additional information

Weight 6270317096 g

7 reviews for MPI Nickel Boron AR-15 5.56 Bolt Carrier Group (BCG)

  1. T


    No problems whatsoever

  2. Henry Christopher (verified owner)

    Bought four of these nib bolt carrier groups. Best price I could find far so good.

  3. Daniel Hightower (verified owner)

    Received in short time as per the usual with KM tactical. Excellent product! It was the final piece of a pistol build that meshed so perfectly it’s like it was made for it. Haha. I already have plans to buy two more for my next two builds.

  4. Eric Sanders

    K&M rep Charlie is a great employee of the company. Very knowledgeable and helpful. The Bcg is a perfect fit.

  5. Eric Sanders

    The Bcg is a perfect fit for my rifle. Thank you for the great price.

  6. Dan Zelna (verified owner)

    Outstanding quality and overall finish !
    Works flawlessly !
    These BCG ‘S are worth way more than what they are charging for them !
    Thanks for a GREAT USA MADE PRODUCT !!

  7. Dan HORVATH (verified owner)

    Nickle boron, is the only bolt assembly I need.
    It cleans up so easily, compared to the “other” bolt assemblies that come standard.
    Well worth a few extra bucks they cost. You can’t go wrong.
    I’ll get one more soon enuf.

Add a review

Your email address will not be published. Required fields are marked *