Toolcraft 308 BCG Nickel Boron Bolt Carrier Group

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This Toolcraft 308 Bolt Carrier Group is finished in Nickel Boron and is designed for use in DPMS pattern AR10 rifles chambered in the 308 family of calibers. It is a full auto BCG and has forward assist serrations.

Nickel Boron is an extremely durable finish with self-lubricating properties so your AR10 cycles smoother and requires less lubrication. Toolcraft has the Nickel Boron finish applied by UCT Coatings of Palm City FL, the same company that applies it for Fail Zero BCGs. Called EXO Technology, this is a patented process that applies a Nickel Boron finish so durable that it is specified on Army 81mm and 60mm mortar tubes, Blackhawk helicopter hoists, and for hard use applications on some Navy ships!  IMO, this may be the ultimate upgrade to the All-American AR-10. And it looks good too! 

This BCG is not for use with DPMS G2 rifles.

For the 6.5 Creedmoor consider a BCG specifically designed for that higher pressure cartridge with a smaller diameter firing pin and double ejectors: 6.5 Creedmoor Double Ejector BCG or 6.5 Creedmoor Nickel Boron Double Ejector BCG.

See views of Toolcraft BCGs here - Toolcraft Gallery

See our 556 Toolcraft BCG review here: Toolcraft BCG Review - Best Black Rifle Secret Ever?

See our blog article Top 3 Reasons You Might Want a Nickel Boron BCG

Explore different finishes here AR15 BCG Finishes  

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.

Customer Photos

Above: This AR10 was built with a Toolcraft 308 Nickel Boron BCG.

Photos below are AR-15 photos 

Above: Toolcraft Nickel Boron (NiB BCG) installed in a partially completed pink themed AR15. The unique Nickel finish is well suited to spiffing up a build. 

Above: Cat Approved! Expect great things when you combine the best Nickel Boron BCG (Toolcraft) on the market with the best upper and lower receivers (Aero Precision) on the market. 

Above: Complete Nickel Boron bolt carrier group as they come from Toolcraft, fully assembled and ready to drop in. 

Above: Disassembled bolt carrier group showing all parts including firing pin, assembled bolt, firing pin retaining pin, cam pin and carrier with gas key. 

Above: Detailed shot of Toolcraft gas key screw staking. 

Above: This NiB bolt carrier group will be paired with a Ballistic Advantage 16" Fluted Stainless 223 Wylde barrel  for the ultimate in reliability, accuracy and good looks. 

Above: Suitable for use with 300 Blackout as well as 223/556, a Toolcraft Nickel Boron BCG is used on this pistol build. 

Above: Nickel BCG installed in this AR15 upper receiver shows silvery contrast against the dark black finish.

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.