MPN: BRK4039


  • Internal threads disrupt gas expansion resulting in less flash
  • Outside 13/16x16 thread compatible with Breek Arms CASTLE BLAST SHIELD C-Style Concussion Device
  • Cone shape lockup provides a tighter and more concentric fit
  • Cage style flash hider with incredible resonance reduction
  • Comes with a crush washer


  • Caliber: 5.56 NATO / .223 Rem.
  • Material: 4140 Prehard Steel
  • Finish: Black Nitride
  • Outer Diameter:
    • Body: 0.73"
    • Muzzle End: 0.91"
  • Bore Diameter: 0.43"
  • Weight: 2.33 oz.
  • Length: 2.14"
  • Thread: 1/2"-28 TPI



  • 1x Breek Arms BFO Cage Style .223/5.56 Flash Hider with Outside Thread
  • 1x Crush Washer


Short-barreled AR pistols are becoming quite popular these days. They give you the firepower of a rifle in a small and easily maneuverable package, which makes them excellent Personal Defense Weapons. However, one of the main problems with using a short barrel, especially with a rifle caliber like 5.56, is that you get a very significant muzzle flash. This muzzle flash can make it difficult to focus on the target and can also be quite concussive, especially when shooting indoors.

This problem can be easily fixed by installing a high-quality flash hider on your AR pistol. The Breek Arms BFO Cage Style flash hider is an excellent option. Designed to work with 5.56 and .223 Remington barrels, this flash hider breaks up the unspent gasses and power from the barrel to prevent combustion. Moreover, it also has specially designed threads on the inside, which effectively disrupt the expanding gasses.

The Breek Arms BFO is a Cage-style flash hider that works with a 1/2"-28 thread pitch. It is made from 4140 Prehard Steel and has a black nitride finish. This excellent flash hider also features external threads, allowing you to install other Breek Arms muzzle devices. For instance, you can use the Breek Arms Castle Blast Shield with the BFO flash hider.

The Breek Arms BFO is an excellent option for any AR-15 Rifle, Pistol, or SBR.

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