Toolcraft 5.56 NATO Complete M16 Bolt Carrier Group - Nitride

Manufactured by Toolcraft
2 Reviews


In Stock


In Stock


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 9310 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
  • 9310 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. 


Bolt FinishSalt Bath Nitride
Bolt Material9310 Steel
Caliber Gauge5.56 NATO
Carrier FinishSalt Bath Nitride
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
High Pressure TestedHigh Pressure Tested
Magnetic Particle InspectMagnetic Particle Inspected

Ratings & Reviews

2 reviews

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  • 2 stars
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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.

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.