Diamondback Firearms 5.56 AR-15 Bolt Carrier Group - Nitride

Manufactured by Diamondback Firearms
Manufactured by Diamondback Firearms
6 Reviews

In Stock

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Diamondback Firearms 5.56 Bolt Carrier Group is coated in a black nitride finish to prevent carbon build up and ensure that your rifle keeps functioning. You can be confident that every part of this bolt carrier group is machined, installed, and tested to a high standard of quality. 

  • 5.56 NATO
  • M16/AR-15 Cut
  • Mil-Spec Staked Hex Screws
  • High Pressure Tested to over 90,000 PSI
  • 16.05 oz
  • Black Nitride Finish

The Diamondback Firearms 5.56 NATO BCG is a great addition to your next build AR-15 or as a back up for your existing rifles. 
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Bolt FinishBlack Nitride
Bolt MaterialSteel
BrandDiamondback Firearms
Caliber Gauge5.56 NATO
Carrier FinishSalt Bath Nitride
Carrier StyleAR-15 Bolt Carrier
High Pressure TestedHigh Pressure Tested
Magnetic Particle InspectMagnetic Particle Inspected
Weight16.05 oz
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

Ratings & Reviews

6 reviews

  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

Not bad!


Tried to look for imperfections. Didn’t find any flaws. Nitride finish is smooth. Stakes look identical to my other pricier bolt carriers. It is not the advertised 16 ounces. No way! Same weight as my other bolt carriers as I juggle each one of them. Should be 11 something ounces. Would I buy this again? Most definitely.

Awesome BCG


These are very nice bcgs some of the best bang for your buck out there

Db bcg


Purchased 2 of these. Ran several hundred rounds thru both no malfunctions no issues. Decent finish would buy again

Good Value, a little odd in finish.

by -

The finish on this works well. It isnt wearing at all so far, and it looks quality upon inspection (no machine marking and good staking). Finding a good MPI Pressure Tested BCG for a good price is getting easier, and Diamondback sits at the front. Only complaint is the finish is a bit sticky, almost as if it is phosphate (it isn't, but it is dry like phosphate).



I have about 1,000 rounds threw this BCG, I ran my AR over gassed and the gas rings wore out rather quickly. And the nitride finish has some decent ware. Other than that no other issues, the fasteners are staked to mil spec standards which is hard to find in a BCG. This BCG would be a great backup.

hard to beat price bracket


you really cant beat this bcg for the price. specially on sale for under 70 bucks. i have 3 now, through a few different rifles, and they all perform perfect, one came in a factory db15, and that rifle is About to tick 15,000 rounds with no issues. the finish is perfect and holds up well, and the machining is beautiful. I have been impressed with the quality and pricing of all the newer diamondback prouducts in the last 4-5 years.