2BO Double Port Ar15 Muzzle Brake Outside Threaded


Add Blast Shield?

Breek Arms CASTLE BLAST SHIELD Concussion Device $32.99

Tools / Extras

Product price: $34.99
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Available in 5.56, 308, and 9mm, The 2BO Double Port Muzzle brake was designed to reduce recoil and muzzle rise. This allows the shooter to stay on target and take follow up shots quickly. This is important when speed and accuracy make the difference such as in competitive shooting or self defense situations.

The brake is machined out of 4140 steel, heat treated for hardness, and nitrided to offer exceptional strength and durability. The 2BO’s large 90 degree ports mitigate recoil and muzzle rise, countering the force generated through firing. This produces less blowback resulting in higher overall shooter comfort. It features a sleek design that integrates seamlessly with any system, maintaining a clean appearance that looks great on any firearm.

  • Design: 2BO Double Port 
  • Outside Thread: 13/16″ x 16 TPI
  • Material: 4140 Heat Treat, Nitrided
  • Comes with 1 Crush Washer
  • Overall length: 2.36 Inches
  • Weight: 2.6 oz (223/556)
  • Designed & Manufactured in America


  • Cal: 223/556; Thread: 1/2×28
  • Cal: 308; Thread: 5/8×24 
  • 9mm : 5/8-24

Breek Arms’ lineup of Outside Threaded Muzzle Devices is an affordable upgrade that gives you the option to run a flash hider or muzzle brake while utilizing our Breek Arms Castle Blast Shield as a forward blast diverter or concussion device. Simply slide the Blast Shield over the outside of the muzzle device and thread the Blast Shield on. This gives the shooter a more pleasant experience when firing especially for shorter platforms that tend to have an overbearing concussion. The added durability of an updated heat treating process increases reliability for higher muzzle pressures. Installation of all Breek Arms muzzle devices are very straightforward and require basic hand tools. 

Additional information

Thread Pitch: No selection

1/2×28, 5/8×24

Caliber: No selection

.308, 5.56/.223, 9mm