AT3™ AR-15 Bolt Carrier Group – 6.5 Grendel Type II – Nickel Boron

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Run Your 6.5 Grendel or 6mm ARC Upper Right with a NiB BCG

It’s important to have a bolt carrier group that has everything you need.  MPI inspected bolt, properly staked grade 8 gas key screws, chrome plated firing pin, plus a lifetime warranty, just in case.  There’s plenty of tough finishes out there too, but few are as slick and tough as Nickel Boron.

Nickel Boron (NiB) coated bolt carriers have greater lubricity than your standard phosphate finish, and are easier to clean than black nitride.  At the very least, it’s easier to see how much carbon you can wipe off to reveal the chrome-like finish after a day of shooting.  And it’s a perfect match for a 6.5 Grendel Type II barrel, or the new 6mm ARC.

The BCG is the workhorse of your rifle – and it pays to have one that runs reliably.  And it’s easy to keep this one in tip-top condition for a lifetime of use.

Made in the USA


  • Caliber: 6.5 Grendel Type II or 6mm ARC
  • Bolt Face Recess: .136″
  • Finish type: Nickel Boron (NiB)
  • Carrier Type: M16 Auto (Ideal for AR-15)
  • Carrier Material: 8620 Gun Steel
  • Gas Key Material: 4130 Steel
  • Gas Key Screws: Grade 8
  • Bolt Material: MPI tested 9310 Steel, Shot Peened
  • Extractor Material: 4140 Steel
  • Cam Pin Material: 8620 Steel
  • Firing Pin Material: 4140 Steel, Chrome Plated
  • Mil-Spec O-Ring and Gas Rings

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

AT3 Lifetime Warranty Logo

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot SightsHandguardsIron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

Customer Reviews

Based on 1 review
David Roberts
AT3 6.5 Grendel BCG

Recently purchased a 6.5 Grendel AT3 BCG, it looks like very high quality, have not had a chance to try it waiting on a barrel from Hart rifle barrels to finish the build for a 6 mm ARC

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.