Toolcraft Nickel Boron AR15 BCG 556

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  • Toolcraft Nickel Boron AR15 BCG 556
  • Toolcraft Nickel Boron AR15 BCG 556


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 158 Carpenter steel. Both are modern ultra-high strength 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 AR15. And it looks good too! 

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

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

See also Toolcraft Black Nitride BCGs


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
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