Toolcraft 5.56 NATO Complete M16 / AR-15 Bolt Carrier Group - Nitride

Manufactured by Toolcraft
Manufactured by Toolcraft
8 Reviews
No Longer Available
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Toolcraft knows bolt carrier groups. It’s what they do, and they do it well. A Toolcraft BCG is built to the highest standards out of the highest quality materials and must pass a long list of requirements before they are shipped out the door to ensure you get a product that will last a lifetime. With a variety of calibers and coatings to choose from, you can find the right one for your build. This Toolcraft BCG is built for 5.56 NATO AR-15 rifles with an M16 profile and rated for full auto use. To ensure it can withstand the wear and tear of heavy use, the carrier is machined from 8620 aircraft quality steel which features a lower carbon content and is case hardened for high strength durability. More importantly, the bolt itself is made from Carpenter 158 tool steel and shot peened to improve high pressure performance. The entire Toolcraft BCG is finished with a Salt Bath Nitride process which physically changes the surface of the material which makes it easy to clean and smooth to run. Toolcraft Inc. is the name you should be searching for when building out your new AR-15.

  • 5.56 NATO with M16 cut profile
  • Full auto rated
  • Salt bath Nitride finish
  • True Mil-Spec dimensions
  • Carpenter 158 tool steel shot peened bolt
  • Aircraft quality 8620 steel carrier
  • 4130 steel gas key with grade 8 staked screws
  • 4140 steel extractor and cam pin
  • Hard chrome ground 8740 steel firing pin
  • Magnetic particle inspected

The mission at Toolcraft Inc. is to build the finest AR-15 and AR-10 bolt carrier groups on the market. They accomplish this goal with the use of high tech machinery, top of the line processes, and rigorous quality control. Their team of dedicated employees are trained to look for any imperfection along the assembly line to make sure no bad products ship out their door. 
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Bolt FinishSalt Bath Nitride
Bolt MaterialCarpenter 158 Steel
Caliber Gauge5.56 NATO
Carrier FinishSalt Bath Nitride
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
High Pressure TestedUntested
Magnetic Particle InspectMagnetic Particle Inspected
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

8 reviews

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Outstanding brand.


I have used these BCGs in my last 3 AR builds and find them to be of the highest quality. I am happy to see Primary Arms add this brand to their already outstanding line of parts. Now I know where to order bolts for all future builds.

More than what you pay for.


I've been incredibly impressed with this BCG. Its out performed some of the bolts I've spent double the price on. I've got about a thousand rounds through it so far with no malfunctions. Sometimes you get what you pay for. Sometimes you get a lot more. Super happy with my purchase.

Simply the best


I tried several brands in a dozen AR pattern builds. I've settled on Toolcraft.
<br>Toolcraft makes the best BCG for the money - period. Full milspec where you need it, exceeds milspec where it counts (bolt). Nitride treatment tops it off. Yes, you can spend more money on a BCG if you want certain cosmetics. But I'd rather save that money for a better barrel.

Fantastic BCG

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Fantastic BCG. My only other AR is my Colt duty rifle. Choosing a BCG for my new rifle was daunting. Toolcraft has an EXCELLENT reputation and physically comparing it to my Colt BCG it is identical. Functions perfectly just like my Colt

C158 bolt

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Not sure if it was an accident, but mine came with a bolt stamped as C158. Not complaining one bit.

Excllent BCG


Excellent bolt carrier group. Considerably lighter than the factory BCG that came with my rifle and there is much less recoil now. Good value for the money; would definitely buy again.

Great for price


Looking for a new BCG? Look no further. HPT and MPI tested. PROPER staking. Mine has several hundred rounds on it and has passed SOTAR/Instructor Chad's testing. While not a KAC or other super-duper top end BCG, it just works.



You can't really get much better than ToolCraft bcg's.<br>Headspaced perfectly on a Colt barrel.<br>Quality machining and finish.<br>No logo or Made In USA on carrier , but bolt has their font markings for HP\MPI.<br>Great price from PA.<br>A+