Open Box Return-Breek Arms BFO Outside Threaded Cage Flash Hider for .300 BLK – 5/8×24

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.30 Caliber Closed Tine Flash Hider

This version of Breek Arms’ closed tine flash hider brings all the benefits of the design to your .300 Blackout AR-15, or .308 Winchester AR-10. This flash hider uses a closed-tine design to eliminate the ringing associated with 3 prong flash hiders, and uses a 13/16 TPI outside thread to attach a Castle Blast Shield.

While this device effectively hides flash from the muzzle, the Blast Shield turns it into a linear compensator, directing noise away from the shooter. This is ideal for any uses that are indoors; while it won’t reduce flash anymore, it keeps concussion and noise directed away from the shooter.

Includes 1 crush washer for easy timing and installation.  Does not include the Castle Blast Shield.


  • Intended Caliber: .300 Blackout / .308 Winchester
  • Muzzle Thread: 5/8 x 24 TPI
  • Outside Thread: 13/16 x 16 TPI
  • Material: Hardened 4140 Steel
  • Finish: Black Nitride
  • Comes with 1 Crush Washer
  • Overall length: 2.36″
  • Weight: 1.9 oz.
  • Length added to barrel: Approximately 1.7 inches

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