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

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Breek Arms Blast Shield

Castle Blast Shield


Breek Arms Blast Shield

Breek Arms Castle Blast Shield for Outside Threaded Muzzle Devices

Compact Flash Hider Threaded for Blast Shield

Do you want the flexibility of having both a flash hider and a linear compensator?  The Breek Arms 3FO-S may be the right pick for your rifle.  Only adding an inch to the length of your gun, this short flash hider features 3 prongs with a milled interior.  The milling on the inside helps divert propellant gases, preventing fireballs and ensuring you always have your sights clear and on target.  One of the coolest features, however, is the outside threads, which allow this flash hider to accept the Breek Arms Castle Blast Shield.  This allows you to convert your flash hider into a linear compensator, which is great on short-barreled builds, and in environments where you want to reduce concussion.

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: 1.50″
  • Weight: 2.2 oz.
  • Length added to barrel: Approximately 1 inch
  • Prong length: 0.75″

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Customer Reviews

Based on 1 review
Joel Maloney
Cool looking little device

I put this on an AR22 build. I think it looks tough, feels quality made, and it doesn't break the bank either. AT3 shipped my order fast, what more could you ask.

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