Aero Precision AR-15 Bolt Carrier Group - Nickel Boron

Manufactured by Aero Precision
SKU: APRH100070
MPN: APRH100070
Manufactured by Aero Precision
18 Reviews

In Stock

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The Aero Precision Nickel Boron Bolt Carrier Group is a substantial upgrade from a standard BGC. Its NiB coating reduces friction on sliding surfaces and prevents carbon build-up making cleaning a much easier task. MIL-SPEC dimensions ensure correct component function and reliability.

  • Machined from 8620 tool steel (carrier) and 9310 carpenter steel (bolt)
  • Forward assist serrations
  • Shrouded firing pin
  • Nickel boron coating inside and out (bolt, carrier, and gas key)
  • Forged MIL-SPEC gas key attached with grade 8 hardware and properly staked.
  • 5.56 NATO bolt is shot peened and magnetic particle inspected
  • MIL-SPEC extractor spring, black extractor insert, Viton O-ring
  • Tool steel extractor
  • Weight 11.52 oz
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Bolt FinishNickel Boron
Bolt Material9310 Steel
BrandAero Precision
Caliber Gauge5.56 NATO
Carrier FinishNickel Boron
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
High Pressure TestedUntested
Magnetic Particle InspectMagnetic Particle Inspected
ManufacturerAero Precision
Weight11.52 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

Ratings & Reviews

18 reviews


Top Quality


although I have not purchased any from Primary Arms, I have gotten 4 directly from Aero Precision and can't say enough good things about them.

Not impressed


I ordered this to be an upgrade to a stock Bushmaster BCG. But at first glance the nickel boron coating didn't look uniform. So disassembled it to see what the moving interfaces looked like on the bolt and the inside of the carrier. I wasn't impressed but the thing that really disappointed me was the firing pin retaining pin holes. The second hole either wasn't properly aligned with the first or there was no piloting feature. this made in impossible to get the pin back in. I own 4 ARs and have never had this issue on a BCG before. The upside was the folks at Primary Arms were great as usual. I returned it and they refunded the price of the BCG and the shipping. Unfortunately I am still looking for that BCG upgrade.

Looks great! One issue though...


Just got my BCG in, spent two weeks deciding who to go with. I read these are coated by Fail Zero from a rep from Aero on a forum (could not verify though) so I thought it would be a good item because they only sell quality items. The fit and finish is great, very high polish, and slick as a new skillet! My only issue, albeit this is my first NiB BCG so it may be normal, is that there is a good bit of sand/polishing compound in many crevices. The compound wiped right off, and the sand did also. The only place I couldn't get it out of was the hex head fasteners on the gas key. It's kind of stuck in the edges around the bolt head. No big deal as I'm sure it will work it's way out, or will come out with a dental pick, but is worth noting nonetheless. Ordered 6AM Monday morning, got here before lunch Wednesday. First purchase from Primary after lurking for a month. Great job guys!

Works perfectly


Matched this up with an Aero Precision forged lower and a 16" Colt SOCOM profile barrel. EWL oil worked nicely to keep it running and clean up was easiest I've had with an AR bolt. Very happy with this purchase and also with Primary Arms. Outstanding service and a variety of top-quality parts at decent prices.

Aero Precision NiB BCG


More than I wanted to pay, but the best BCG I've found without spending over $200.

Awesome product and service!


Primary Arms never disappoints! Always have the latest products at the best prices and ship very fast!

great value


super smooth operation very nice

Look great


The bolt carrier is polished and looks great. Preformed flawslessly on my initial range session. The only concern I had was that the bolt itself appears to be coated but not polished like the rest of the carrier. No big deal but would have been nice.

Great Bolt Carrier


I would give it 5 stars but i'm not because when I took out the pin that holds the firing pin I could not get it back in. It expanded as it should when it was taken out but it expanded so much that it would only go 3/4ths of the way in. Overall great bolt carrier, very nice finish and is very durable. Would buy again.



With aero precision's craftsmanship an primary arms super fast shipping u cannot go wrong nice bcg for any build the nickel boron is twice as easy to clean !