AT3™ AR-15 Nickel Boron Bolt Carrier Group - 6.5 Grendel/6mm ARC
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From orders that included this itemProduct description
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
Specifications:
- 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
Customer reviews 13
AT3 Tactical · Thank you for taking the time to leave a review for our AT3™ AR-15 Nickel Boron Bolt Carrier Group. We're glad to hear that you found it to be an excellent bolt. We strive to provide top-quality products for our customers and it's great to know that we hit the mark for you. Thanks again for your support!
Robbie · 3 stars despite not having used it? Actually, reviewing before using it seems incredibly odd. I will say what the manufacturer won’t say… what the f*ck are you doing? Review after or don’t review at all.
AT3 Tactical · Hi there, thanks for leaving a review on our AT3™ AR-15 Nickel Boron Bolt Carrier Group. We appreciate your feedback and hope that you will have the opportunity to use it soon. We understand that the weather can be a factor, but we have full confidence that our product will work well for you when you do get the chance to use it. Stay warm in Minnesota!
AT3 Tactical · Thank you for leaving us a review for our AT3™ AR-15 Nickel Boron Bolt Carrier Group in 6.5 Grendel/6mm ARC. We're thrilled to hear that it has been running smoothly with 250 rounds through it and that it was easy to clean. We appreciate your support and look forward to potentially helping you with your 22 ARC build in the future. Thanks again!
Questions & Answers 1
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Warranty & returns
Backed by the AT3 Lifetime Warranty!

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.
This includes AT3 Red Dot Sights, Handguards, Iron 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.
90-day no-hassle returns
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.
















