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Questions & Answers
Is this M16 profile?

M16 style with more mass for better functioning in semi or full auto style rifle .

by Jeff Shelton, Verified Owner, May 30, 2025
Will this BCG function well in a Ruger 556? Expert Answer

Yes there should be no issue.

by Jonathan D., Gear Expert, June 16, 2018
Customer Reviews
Helpful Positive Review
Great product and great price! by Tommy Boy, February 1, 2020
Well made product and worked excellent in my gun. Easy to keep clean and made in USA and can’t go wrong made in the USA by veterans. Would highly recommend. I will definitely be ordering from this company again in the future.
4/4 found this helpful
Helpful Positive Review
Precision where it counts! by Frankie4fingers, Verified Owner, April 9, 2022
I bought this BCG to replace my worn out stock S&W BCG. After the first 1000 rounds I can say this has durability and quality built right in. Impressed with the smooth action it provides as well. It seems like it will be around for the long haul. The...
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2/2 found this helpful
Helpful Positive Review
Worth the extra money by Kevin, May 3, 2017
I just returned a boron-nickle coated BCG from another company, which I had bought from another online retailer -- it turned into a nightmare, and this was a fairly well known sight. Word of caution: look to be sure that retailer even HAS a return po...
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15/15 found this helpful
Helpful Positive Review
This is The Best bcg that i own. SLIDES lIKE BUTTER VERY SLICK. IF YOU WANT THE BEST THEN BUY American Built Arms bcg. I research bcgs for a long time .I read all the reviews i could find on the web. Before making the decision to buy. For the money y...
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8/8 found this helpful
Helpful Positive Review
AB Arms BCG by T4z, Verified Owner, July 30, 2018
I wanted an extra bolt assembly to keep in the grip compartment for a backup, and happened to see a review of this AB Arms bolt carrier group online. I liked the idea of it being slicker, so supposedly carbon gunk won't stick as easily. The vet-run...
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3/3 found this helpful
Helpful Positive Review
American Built Arms bolt carrier group is amazing! The bolt and carrier are extremely well built, and the finish is nothing short of stellar. Super high quality from a Veteran owned and ran company! I would not hesitate to purchase again! Awesome!
1/1 found this helpful
Read All 21 Reviews
Color: Silver Finish: Nickel Boron Caliber: 5.56x45mm NATO Gun Make: AR Platform Hand: Right Condition: New

Code: 2AM-BCG-ABABCG-ABABCGNiB

MPN: ABABCGNiB

UPC: 859143003535

List: $219.99Save 10%
$197.99

Product Info for American Built Arms Company PRO 5.56 Bolt Carrier Group (BCG)

The AB Arms PRO Advanced Rifle Bolt Carrier Group BCG is specially made to have exacting tolerances and surface finishes and built to Mil-Spec dimensions. These Bolt Carrier Groups by American Built Arms Company are built of 8620 steel and coated in Nickel Boron with a Nickel Boron coated bore, so you'll need nearly no lubrication. The extractor of the American Built Arms Co PRO 5.56 BCG is made from aircraft grade E4140 steel, and is coated in manganese phosphate to provide superior extraction during each fire. Drop in ready, this AB Arms NiB Bolt Carrier Group BCG is the perfect addition to any MSR.image

Specifications for American Built Arms Company PRO 5.56 Bolt Carrier Group (BCG):

Manufacturer: American Built Arms Company
Color: Silver
Finish: Nickel Boron
Fabric/Material: Steel
Carrier Material: 8620 Steel
Bolt Material: 9310 Steel
Caliber: 5.56x45mm NATO
Gun Make: AR Platform
Hand: Right
Condition: New

Features of AB Arms PRO Advanced Rifle Bolt Carrier Group BCG, 2AM-BCG-ABABCG:

  • Bolt Carrier made of 8620 Steel, Nickel Boron Coated with Nickel Boron Coated Bore
  • M-16 Style with more mass for better functioning in semi or full auto rifles
  • Gas Key made of 4130 Steel and Nickel Boron Coated
  • Gas Key Screws - 4140 Steel properly staked per Mil-Spec requirements
  • Cam Pin made of 4340 Steel, Heat treated per Mil-Spec Requirements, and Nickel Boron Coated
  • Extractor made of Aircraft Quality E4140 Steel, Heat treated and Shot Peened per Mil-Spec Requirements, and Manganese Phosphate Coated per Mil-Spec Requirements
  • Firing Pin made of AISI 8740 Steel and Chrome Coated

Package Contents:

  • American Built Arms Company PRO 5.56 Bolt Carrier Group, 2AM-BCG-ABABCG

American Built Arms Company PRO 5.56 Bolt Carrier Group (BCG) Orderable Models

List of Orderable Models

  • American Built Arms Company Pro 5.56 Bolt Carrier Group BCG, Nickel Boron, Silver, ABABCGNiB , MPN: ABABCGNiB , UPC: 859143003535 , Code: 2AM-BCG-ABABCG-ABABCGNiB

American Built Arms Company PRO 5.56 Bolt Carrier Group (BCG) Unavailable & Discontinued Models

List of Unorderable Models

  • USED, American Built Arms Company Pro 5.56 Bolt Carrier Group BCG, Nickel Boron, Silver, ABABCGNiB , MPN: ABABCGNiB-EDEMO , Code: 2AM-BCG-ABABCG-ABABCGNiB-EDEMO-RE-B
  • American Built Arms Company Pro 5.56mm Bolt Carrier Group BCG, Black/Silver, Small ABABCGNBB , MPN: ABABCGNBB , UPC: 859143003443 , Code: 2AM-BCG-ABABCG-ABABCGNBB
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