Nickel Boron BCG Toolcraft C158

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  • Toolcraft Nickel Boron BCG is one of the best BCGs on the market today. Precision manufactured on state-of-the-art CNC machinery in North Carolina, Toolcraft AR15 parts are trusted by the U.S. Military and carry a Lifetime Warranty.

    A bolt carrier group is only as good as it’s bolt. These bolts are manufactured from Carpenter 158 steel, the same high strength steel specified by the US Military for M16 bolts. See also our 9310 steel Nickel Boron BCG

    Nickel Boron is an extremely durable finish with self-lubricating properties so your AR15 cycles smoother and requires less lubrication. IMO, this may be the ultimate upgrade to the All-American AR15. And it looks good too! See our Nickel Boron BCG Collection.

    This is a 223/5.56/300 Blackout bolt carrier group.

    This AR BCG will not work with 6.5/6.8/308 etc.

    Buy with confidence! FREE SHIPPING + 30-DAY NO-HASSLE RETURNS.

  • Bolt Shot Peened; MPI
    Bolt Material Carpenter 158 Steel
    Bolt Finish Nickel Boron
    Caliber 223/5.56/300 Blackout
    Extractor O-ring Viton; Mil-spec
    Carrier Material 8620 Steel
    Carrier Finish Nickel Boron
    Carrier Design Heavy Profile M16 Style
    Gas Key Material 4130 Steel
    Cam Pin Material 4140 Steel
    Cam Pin Finish Nickel Boron
    Firing Pin Material 8740 Steel; Hard Chrome Plated

Customer Reviews

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David G.
United States

Great service

Experience was great ,customer service awesome ,shipped in a timely manner Will continue to do business with

Leadington, MO


Super fast delivery, amazing quality, and great customer service! Will recommend to everyone I know

Shane M.
United States


so far great. have not used yet but seems good quality

Craig McIntyre
Pierre, South Dakota

A Hypocrites Review

Prior to ordering this BCG I read the reviews and just shook my head in dismay. How could so many reviewers rate this product without having test fired it? Well, here I am, and I'm admittedly quite sheepish. But, upon thoroughly cleaning the BCG and inspecting it under a magnifying lens and a micrometer in hand, I am impressed. This is a finely crafted product, no burrs, or tool marks, and the finish is phenomenal. I have a number of different BCGs, some much more expensive, but none better. I can't wait to test it. But, alas, its snowing and -5 Fahrenheit. Thank you for your service to our country Mr. Blazek, and for your obvious business acumen in providing a good product and good customer support.

Robert J.
United States

Customer service...

...made this purchase great. I’ll be a repeat customer, for sure! Thank you, Dave.