Toolcraft 5.56 NATO Complete M16 Bolt Carrier Group - Nickel Boron

Manufactured by Toolcraft
Manufactured by Toolcraft
6 Reviews

Out of Stock

NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.



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 steel and shot peened to improve high pressure performance. The entire Toolcraft BCG is finished in Nickel Boron which is a top of the line coating that is extremely smooth to reduce friction. It is also great at dissipating heat for reducing wear and tear for long term durability. 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
  • Nickel Boron coating
  • True Mil-Spec dimensions
  • C158 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 FinishNickel Boron
Bolt MaterialCarpenter 158 Steel
Caliber Gauge.223/5.56
Carrier FinishNickel Boron
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
High Pressure TestedHigh Pressure Tested
Magnetic Particle InspectMagnetic Particle Inspected

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

6 reviews


A really nice BCG at a GREAT price!

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This item is of good quality, fit & finish comparable to higher end competitor's BCG. I'll be purchasing more real soon.

Great BCG

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I installed on of these in my ATI Omni Maxx AR pistol. Fired about 200 rounds with zero malfunctions.

C-158 bolt, billed as 9310?

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BCG arrived in a a bubble wrap envelope inside a Uline box...nothing from Toolcraft as far as boxing or documentation.
<br>Ok, I guess...I'm easy going...
<br>But the carrier was full of some kind of stuff, I'm guessing polishing media?
<br>Dis-assembled and cleaned..bolt is a thing of beauty, but stamped C158, description says
<br>My first PA buy.
<br>Shipped fast...wondering if I should gripe and return.
<br>From PA: We've been getting mixed batches of C158 and 9310 on this one. We'd be happy to accept a return or swap it out for you.

FIne Craftsmanship

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BCG looks like a work of art.
<br>Arrived dirty tho, full of polishing media or something.
<br>Most importantly, bolt is marked C158, not 9310.
<br>I count that as a positive, I guess.



This is the BCG that I use in all my uppers (.223, 5.56 and .300BLK). The finish is very smooth and cleans up easily. With a "lifetime warranty" from Toolcraft and fast shipping from PA, you just can't go wrong.

Well worth your money. Your AR will love you for it.

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Shipped fast and at the right price. Excellent quality and no tool marks anywhere. Great finish and eats everything I have fed it from steel case to brass. Bolt is true 158 Carpenter steel MPI.<br>Great price to value.