AR-15 Toolcraft Nickel Boron Bolt Carrier Group C158

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This will be the last bolt carrier group your AR-15 will ever need!  Beneath this premium Nickel Boron finish is one of the highest quality bolt carrier groups on the market today.

Precision manufactured on state-of-the-art CNC machinery in North Carolina from the highest quality modern steels, these bolt carrier groups are trusted by the U.S. Military and carry a lifetime, no questions asked, warranty.

Nickel Boron is an extremely durable finish with self-lubricating properties so your AR-15 cycles smoother and requires less lubrication. IMO, a Nickel Boron BCG may be the ultimate upgrade to the All-American AR-15. And it looks good too! 

Toolcraft AR-15 Nickel Boron Bolt Carrier Group

Toolcraft is a major OEM manufacturer of bolt carrier groups for the U.S. Military and many large firearms manufacturers. We buy direct from Toolcraft and pass the savings on to you. You get OEM quality without the logo and the steep markup.

Bolt is Carpenter 158 Steel.  For 9310 Alloy Steel see here: Nickel Boron BCG 9310.

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

AR15 Bolt Carrier Comparison Semi vs Full Auto

Our BCGs come standard with a full profile carrier while many AR-15s these days are sold with a lightweight semi-auto carrier. The difference can be seen in the photo above. The full profile carrier simply has more weight to it, about 0.5 oz. more.  Just like a heavier buffer, a heavier carrier can have certain benefits in an AR-15. 

The extra weight helps to smooth the function of the AR-15 by slightly delaying the unlocking of the action allowing pressure in the chamber to decrease, resulting in more consistent and reliable case extraction.

The extra weight also causes the bolt carrier group to move forward with more authority, stripping and feeding the next round from the magazine into the chamber more reliably. This can be especially helpful if the rifle is dirty or under lubricated.

Since the carrier and buffer essentially act as a unit during the cycling of the rifle, the use of a full profile carrier over a semi-auto carrier adds roughly two-thirds of the weight you'd get by going to the next heavier buffer.   

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Christopher D.
United States

Great place to buy quality equipment from

I scoured the Internet looking for a quality bolt carrier at a reasonable price and luckily stumbled onto spicetac. After looking them up and reading their reviews I decided to take a chance on them. I could be happier, no only with the product I received but with their fast shipping awesome communication and personal touch that they put into everything that they do. I would rather buy American made from the little guy versus from the big faceless corporation. I will gladly purchase from these guys again. Thanks!

Louis O.
United States


Excellent customer service, fast shipping, overall great shopping experience. I look forward to shopping with Spicetac again.

David C.
United States

Service Feedback

The service and buying experience could not have been easier. Order was processed quickly, well packaged, and great communication. Will definitely shop with Spice Tac in the future. Wish I had known about this store previously!!!

Robert L.
United States

AR parts

Very good quality ,and the service was first class.

Patrick G.

Good price! Fast service!

The parts I ordered were well packed as if airdropped to my door. They came quickly and with a nice hand written note on the invoice. Great job spicetac.


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