AT3™ AR-15 Bolt Carrier Group – 5.56 NATO/.300 Blackout – Nickel Boron


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Get the Performance You Need with a Nickel Boron Bolt Carrier Group

Whether you’re starting a fresh build or upgrading from stock, a bolt carrier group that performs reliably is key to a lifetime of use.  This BCG uses a nickel boron plating, resulting in a matte finish similar to hard chrome, which is far easier to clean than typical phosphate BCGs.  The nickel boron coating is also far slicker, resulting in less wear on your receiver, and more reliable function over time.

The finish has its own set of benefits, but the hardware below it is high-quality too.  The bolt is made from 9310 Steel, which has been MPI tested to protect against mechanical failures.  The firing pin is 4140 steel and chrome plated per military specifications as well, and the gas key is staked with grade 8 fasteners.

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.  And of course, it’s made in the USA.

Note: Your bolt’s extractor may be nickel boron or black nitride. Either coating will not affect reliable function.


  • Caliber: .223/5.56, .300 Blackout, .350 Legend
  • Finish type: Nickel Boron
  • 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
  • Weight: 11.5 oz.

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 12 reviews
Michael Ballard
Easy shopping

Awesome bolt carrier

David Gardiner
Just got it

Just came in fit perfectly in my 300 blackout build, color adds the little flair to it.

Good company and great customer service

Looks good but not in use yet.

Thank you for your feedback! We're glad to hear that you're happy with the product and the customer service. We're looking forward to hearing how it looks once it's used in the field.

Stephen Sim

Smooth and consistent shooting. It is an awesome, well-engineered part!

Thanks for the review! We're glad you're enjoying it!

Andy Waltrip

AT3™ AR-15 Bolt Carrier Group - 5.56 NATO/.300 Blackout - Nickel Boron

Thanks for the review! We're glad you're enjoying the product.