Breek Arms 3FO Outside Threaded AR 15 Flash Hider for .223/5.56 – 1/2×28

SKU: BRK4056

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Breek Arms Blast Shield

Castle Blast Shield


3 Prong Flash Hider Compatible with Blast Can

Breek Arms has an excellent design for a 3-prong flash hider in the 3FO.  Each prong features a grooved interior to disrupt propellant gases, with milling on the outside to reduce weight and the tuning-fork effect.  The coolest feature of the 3FO is its ability to accept the Breek Arms Castle Blast Shield with its outside threads.  When you’re shooting indoors or with a short-barrel AR, a flash hider can prove to have quite a bit of concussion.  Just by attaching the blast shield, the noise and concussion is vented forward, keeping your recoil linear while sparing your ears.  This kind of flexibility in a flash hider is also great for rifles you plan to pin and weld.  This muzzle device adds about 1.7 inches to the barrel, which is just about perfect for a 14.5 inch barrel.  Since you can choose between flash reduction and eliminating concussion, you’ll be able to keep your options open for a permanent install.

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


  • Intended Caliber: .223 Remington/5.56 NATO
  • Muzzle Thread: 1/2 x 28 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: 2.8 oz.
  • Length added to barrel: Approximately 1.7 inches
  • Prong length: 1.5″

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Customer Reviews

Based on 4 reviews
Kevin Manns
Perfect for my ar pistol

It made my ar pistol look good it’s a well made product

Austin Hudson
So far

So far I like it I built a 14.5 and it was the perfect length to pin it I have not had a chance to run it through its paces but would be happy to follow up

Flash Hider

Hides flash, looks great. Would buy again

Thank you for the review! We're glad you're happy with the flash hider.

Eric Bergemann

This is the best flash mitigating device for the money, without question! Nothing comes close to the value your getting. I came across their flash hider doing a random search and decided to give it a shot. Best decision ever. This flash hider performs in the spectrum of the JP/ BE Meyers 249F as far as mitigating flash. The threading on the inner diameter of the prongs is the secret to their success. It quashes any chance of ignition by disrupting the flow of exiting gasses. Great design accompanied by great quality at an economical price. Mine came with a grayish nitride rather than the black you see in the photos, but that didn’t bother me. I would seriously put this up against DEAD AIR, SUREFIRE, AAC, ect... Breek Arms has phenomenal customer service and the genuinely care about their customers feedback. Honestly, it looks great and performs phenomenally well for under $30. Other than an A2 nothing comes close.

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