Breek Arms BFO Flash Hider Cage Style Outside Threaded Muzzle Device 223/556 1/2x28 Black. Simply slide the blast shield over the outside of the muzzle device and turn 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. Specifications for Breek Arms BFO Flash Hider Cage Style Outside Threaded Muzzle Device: Manufacturer: Breek Arms Color: Black Finish: Nitrided Fabric/Material: 4140 Heat Treated Gun Make: AR Platform Gun Model: AR-15 Barrel Material: 4140 Steel Length: 2.1 in Inner Diameter: 0.38 in Outer Diameter: 1 in Condition: New Country of Origin: USA Features of Breek Arms BFO Flash Hider Cage Style Outside Threaded Muzzle Device Rated for 10.5'' barrels and up. Internal Threads Disrupt Gas Expansion Resulting in Less Flash Design: 3FOC: 3 Prong Caged Outside Threaded Flash Hider Outside Thread: 13/16 x 16 TPI Material: 4140 Prehard Steel Nitrided Cone Shape Lockup Provides a Tighter & More Concentric Fit Comes with 1 Crush Washer Overall length: 1.58 Inches Weight: 2.2 oz (223) 1.9 oz (9mm) Package Contents: Breek Arms BFO Flash Hider Cage Style Outside Threaded Muzzle Device Crush Washer What firearm models does the manufacturer say Breek Arms BFO Flash Hider Cage Style Outside Threaded Muzzle Device is compatible with? The manufacturer suggests that Breek Arms BFO Flash Hider Cage Style Outside Threaded Muzzle Device is compatible with AR-15Breek Arms BRK4039: BFO Flash Hider Cage Style Outside Threaded Muzzle Device 223/556 1/2x28 Black