AT3™ AR-15 Replacement Bolt – 5.56 NATO/.300 Blackout – Black Nitride


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AT3 Replacement AR-15 Bolt

This AR-15 replacement bolt from AT3 Tactical easily replaces a broken bolt in your rifle. This bolt comes complete with extractor and ejector assemblies already installed in the 9310 steel, shot-peened bolt. Every bolt comes with a set of gas rings, as well as a mil-spec o-ring under the extractor. Don’t let a broken extractor or sheared locking lugs get you down – be prepared with a spare bolt from AT3 Tactical!


  • Caliber: .223/5.56, .300 Blackout, .350 Legend
  • Finish type: Black Salt Bath Nitride
  • Bolt Material: MPI tested 9310 Steel, Shot Peened
  • Extractor Material: 4140 Steel
  • Cam Pin Material: 8620 Steel
  • 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 4 reviews
Stephen Lick
Good quality for the price.

I have looked for replacement bolts all over the web. I wanted them for back up not for direct replacement and AT3 had me covered with these. Love AT3 to the moon and back!

Thank you for taking the time to leave a review for our AT3™ AR-15 Replacement Bolt. We are thrilled to hear that you found our product to be of good quality and a great price. It was our pleasure to provide you with a reliable back up option. We appreciate your support and we love having you as a customer. Thank you again for choosing AT3!

Michael Green

AT3™ AR-15 Replacement Bolt – 5.56 NATO/.300 Blackout – Black Nitride

Thank you for leaving a review for our AT3™ AR-15 Replacement Bolt in 5.56 NATO/.300 Blackout with Black Nitride coating. We are glad to hear that you are satisfied with your purchase. If you have any further questions or concerns, please do not hesitate to reach out to us. We appreciate your support and hope to continue providing you with quality products. Thank you for choosing AT3 Tactical.

Mark Rimer
Fast shipping and prompt customer service. And a quality bolt.

The At3 bolt seems to be a quality part. Finish was nice and I had no problems with fit or function. Brass pooled in a neat pile from a bench rest.

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

Manuel Montano
Snug fit

The bolt arrived very quickly and looks nice and clean. The only problem is that it fits very snug on the carriers I've installed it on. I'll probably have to polish it a little to loosen it up because it is not cycling properly. It extracts and ejects the casing correctly but does not chamber the next round.