AT3™ AR-15 3-Port Muzzle Brake with Crush Washer – 5/8×24 Thread for .300 BLK/.308 WIN

SKU: MZ1002-3B-N

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Armorer's Wrench for AR-15 & Multi-Function Tool by AT3™

Armorer’s Wrench for AR-15 & Multi-Fuction Tool by AT3™


Birchwood Casey Shoot-N-C Target - Round Bullseye - 12" - 5 Targets

Birchwood Casey Shoot-N-C Target - Round Bullseye - 12" - 5 Targets


.30 Cal AR15?  Not a problem with this aggressive Muzzle Brake/Compensator

With greater caliber comes greater recoil – whether you’re shooting a .300 BLK AR15 or a .308 WIN AR10, .30 caliber is a lot different than standard 5.56.  So, you might consider something more aggressive to help reduce recoil and stay on target.  Similar to more expensive designs on the market, this 3-port muzzle brake/compensator does the same job as many 3-port brakes – dispersing recoil and muzzle blast to either side of the shooter, reducing recoil going into the shooter’s shoulder.  It also compensates through three angled ports in the top of the device, which counteracts recoil by subtly pulling the rifle forward, and pushing it downward.  The result is a device that diminishes muzzle flip and overall force for the shooter, leaving only the momentum of the bolt carrier to deal with.

It’s a great US-made product, includes a crush washer, and is backed by the AT3 Lifetime Warranty.


  • Diameter: 1 inch
  • Wrench Flats: 0.75 inch
  • Length: 2.5 inch
  • Weight: 3.5 oz.
  • Finish: Black Nitride

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 17 reviews
Scott Suchovsky
Outstanding product

Test fired the new build today. .300 Blackout pistol, 8.5” barrel. I’m amazed how little muzzle rise there is. It damn near non-existent. Not to mention it looks as good as it performs.

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

Coach Barry
Looks and performs great

This muzzle brake looks great and performs great at a very affordable price. I will be ordering more

josh montano

works great. staying on target through high zoom scope much easier

Thank you for sharing your positive experience with our AT3™ AR-15 3-Port Muzzle Brake! We're thrilled to hear that it has improved your accuracy while using a high zoom scope. Happy shooting!

Well made

Very nice seems well made but was a pain in the rear getting it lined up but got it done

Thank you for your review! We're glad to hear that you found our AT3™ AR-15 3-Port Muzzle Brake to be well made. We apologize for any difficulty you experienced in getting it lined up, but we're happy to hear that you were able to get it done. If you ever need assistance, please don't hesitate to reach out to our customer service team. We're always here to help. Thanks for choosing AT3 Tactical!

William Price
Muzzle Brake

AR-15 3-Port Muzzle Brake with Crush Washer - 5/8x24 Thread for .300 BLK/.308 WIN fits good and works great , and at3 has good deals on parts. bill

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