2 Port Outside Thread Muzzle Brake - Available 223 & 30 cal

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Note: For the BLEM Castle Blast Shield option, the blemishes are small scratches on the inside of  the blast shield. They are from removing supports during the annodizing process, they are not a used item.

Breek Arms offers a low cost option to competitive muzzle brake designs used for increasing muzzle control as well as adding a custom design to your platform. The combination of ports and holes helps disperse gases up, left and right to reduce the level of muzzle climb and felt recoil. Also, the included outside thread allows you to quickly detach your own blast shield or suppressor.

  • Design: 2 Port OT Muzzle Brake (outside thread) 
  • Outside Thread: 13/16" x 16 TPI
  • Material: 4140 Steel Nitrided
  • Comes with 1 Crush Washer & 1 Lock Washer
  • Overall length: 2.26"
  • Front end width: 0.71" diagonal, 0.60" square edge
  • Length from front end to the stop: 1.96"


  • Cal: 223/556; Thread: 1/2x28; Weight: 2.2 oz (weights include 1 crush washer)
  • Cal: 308; Thread: 5/8x24; Weight: 1.8 oz
  • Cal: 9mm; Thread: 1/2x28; Weight: 1.9 oz
  • Cal: 308; Thread: M14x1LH

8 Reviews Hide Reviews Show Reviews

  • 3

    Posted by lee buckley on Nov 16th 2020

    Ordered qty. 2, Received breaks with different configurations on the threaded end. On one, the outside dia. threads was not undercut which prevented my form 1 suppressor from going flush with the flange. The other had the undercut, but the 5/8-24 threads are about 1/4" longer.

  • 5
    Blast Shield

    Posted by hyee on Aug 1st 2020

    item arrived well packaged. quality seems to be very nice and items fit and finish were outstanding! no problems putting the brake and the shield on and everything fit perfectly!

  • 5
    5/8 brake

    Posted by terrance J roush on Jul 28th 2020

    very light. Added a blast shield for the 300blk fits inside my very slim handguard. Very easy to install.

  • 5
    Blast Shield

    Posted by Kellen on Jul 25th 2020

    First I love their story, second I love the quality, third I love the service. I put the blast shield on my 7in AR-15 pistol. Not only does it feels great, it does what it's intended for and it looks super sick. Thanks!!!

  • 4
    Works great

    Posted by Travis on Jul 21st 2020

    Fits really nice helps a lot with recoil how ever I did not get the blast shield can and the thread protector that goes over it if not installed was the wrong one with the product kinda wish I received the right one looks silly with out it Breek Arms Comment: Thanks for your feedback! There is no thread protector included with this item, the item you are referring to is the jam nut that is included that can optionally be used to install it instead of the crush washer. Hope this clears things up!

  • 5
    Great Product and Fast Shipping!

    Posted by Zachary Roberson on Jul 13th 2020

    I’m very please with the look of my new muzzle with the castle blast shield. It looks great and performs exactly how it should. I would definitely recommend one to anyone looking for a 2 in 1 muzzle brake.