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Q&A for American Built Arms Company PRO 5.56 Bolt Carrier Group (BCG) — 15 Questions & 16 Answers

Name American Built Arms Company PRO 5.56 Bolt Carrier Group (BCG) (4.9)
$192.00 $179.99 Save $12.01
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Q
James, member, from GU, United States, asked on May 21, 2025

Is this M16 profile?

A
Answered by Jeff Shelton, member, from KY, United States, on May 30, 2025

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

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Q
Felix Chaco, member, from GU, United States, asked on April 10, 2018

Will this BCG function well in a Ruger 556?

Expert Answer
A
Answered by Jonathan D., Gear Expert, from IL, United States, on June 16, 2018

Yes there should be no issue.

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Q
TacOpsAJ, member, from OR, United States, asked on December 11, 2022

Will This BCG Function With 300BLK Cartridge?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on December 19, 2022

Yes, the American Built Arms Company PRO 5.56 Bolt Carrier Group will function as intended with 300 Blackout.

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Q
CRAIG DAVIS, member, from PA, United States, asked on July 01, 2022

Will this BCG work on Tula primers in AR 15 with BCA upper?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on July 15, 2022

The American Built Arms Company PRO 5.56 Bolt Carrier Group will work in a Mil-Spec upper receiver. It should work fine with all compatible ammo regardless of the primer.

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Q
Josh, member, from ME, United States, asked on March 16, 2022

Does this bcg have a milled slot on the bottom or is it solid?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on March 28, 2022

The American Built Arms Company PRO 5.56 Bolt Carrier Group is a Mil-Spec BCG. It has a milled opening on both the top and bottom.

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Q
Segundo, member, from WA, United States, asked on February 18, 2022

Will this work on Colt M4 Carbine 556?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on February 21, 2022

Yes, the American Built Arms Company PRO 5.56 Bolt Carrier Group will work with a Colt M4 Carbine.

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Q
Chris C, member, from NY, United States, asked on February 11, 2022

Is this BCG high pressure tested and magnetic particle inspected??

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on February 15, 2022

Yes, the American Built Arms Company PRO 5.56 Bolt Carrier Group is HPT and MPI.

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Q
AK, member, from NY, United States, asked on February 04, 2020

what grade steel is the bolt made of? every other piece spec is listed except the bolt.

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on February 07, 2020

Here are the specifics on all of the components:

Bolt:
Carpenter 158 Steel
Heat treated per Mil-Spec Requirements
Shot Peened per Mil-Spec Requirements
MPI Tested Material
Nickel Boron Coated

Bolt Carrier:
8620 Steel
Nickel Boron Coated
Nickel Boron Coated Bore
M-16 Style with more mass for better functioning in semi or full auto rifles

Gas Key:
4130 Steel
Nickel Boron Coated
Gas Key Screws - 4140 Steel properly staked per Mil-Spec requirements

Cam Pin:
4340 Steel
Heat treated per Mil-Spec Requirements
Nickel Boron Coated

Extractor:
Aircraft Quality E4140 Steel
Heat treated per Mil-Spec Requirements
Shot Peened per Mil-Spec Requirements
Manganese Phosphate Coated per Mil-Spec Requirements

Firing Pin:
AISI 8740 Steel
Chrome Coated

7 of 7 found the following answer helpful.
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Q
west, guest, from IL, United States, asked on December 16, 2019

Will it run .223

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on February 07, 2020

Yes, you can run .223 out of this bolt carrier group.

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Q
gabe v, member, from CO, United States, asked on July 28, 2019

will this work in my sig m4 5.56?

Expert Answer
A
Answered by Robert G., Gear Expert, from IL, United States, on October 04, 2019

Please email us at techsales@opticsplanet.com with the full make and model of your firearm as Sig Sauer has certain models these are not compatible with.

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