Toolcraft 556 NATO Nickel Boron BCG

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A Toolcraft Nickel Boron BCG is, hands down, one of the best Nickel Boron BCGs on the market today. The bolt carrier group is one of the most important AR15 parts, critical to the safety and proper function of the AR15. Toolcraft understands this and precision manufactures these bolt carrier groups on state-of-the-art CNC machinery in North Carolina to such high standards that they are trusted by the U.S. Military and carry a lifetime warranty.

A bolt carrier group is only as good as it’s bolt. Choose from either the very popular 9310 steel or the mil-spec Carpenter 158 steel. Both are ultra-high strength modern steels designed specifically for applications where high strength and durability are of paramount importance. 

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 AR-15.  And it looks good too! Now with over 100 5-star reviews! 

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

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

Also see our Fail Zero Nickel Boron BCG.

Bolt Shot Peened; MPI
Bolt Material 9310 or 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 M16 Full Auto Style
Gas Key Material 4130 Steel
Cam Pin Material 4140 Steel
Cam Pin Finish Nickel Boron
Firing Pin Material 8740 Steel; Hard Chrome Plated
Manufacturer Toolcraft


Note: Some dealers are selling Toolcraft BCGs that have been finished after leaving Toolcraft. The finish on those BCGs would not be warrantied by Toolcraft. All Toolcraft bolt carrier groups sold by SpiceTac include the 100% no-questions-asked Toolcraft warranty.

Why Toolcraft

A note from Toolcraft

Toolcraft carriers are made from the best materials that can be purchased in the market today. Regardless of the coating you choose, the carrier that it protects is made the right way, with no compromise of standards using materials that are Made in the USA. There is the basic 8620 steel, a better grade of Gun Quality 8620 steel, an even better grade of Aircraft Quality 8620 steel, but then there is the best Aircraft Quality 8620 steel that is proprietary to Toolcraft only and no one else. These high standards of materials set us apart from the rest.

While some manufacturers have compromised the Mil-Spec standards of machining just to add to their profits, Toolcraft has stayed loyal to the Mil-Spec machining standards since the beginning.

All Toolcraft carriers are post-heat treat machined to remove any distortion that has occurred during the heat treat process. We first grind the outside rails that are in contact with the upper after heat treat. Next, we machine the inside bore where the bolt is doing the work. This ensures the gas rings are not damaged and that the weapon cycles and charges smoothly. These standards are not just met, but we exceed them on every operation during the machining processes and this effort gives our carriers a superior finish with no machining lines.

Toolcraft machines each carrier to last for thousands of rounds and that is why we can offer with confidence a Lifetime Warranty on our products. These standards have given each consumer the confidence that when they use a Toolcraft bolt carrier group in their weapon, it will do what it was created to do, round after round for years to come.

Lifetime Warranty

Toolcraft products carry a lifetime warranty.

Simply put...Should any of our products fail, return it to us for a brand new replacement.


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