Fortis Manufacturing 5.56MM R.E.D. Black Nitride Coated Barrel Muzzle Brake. We wanted to develop engineer and design a military grade accessory that not only functions great but looks great also. Tested and evaluated by people in the military and law enforcement community - then put to the test by members of the 3 gun community we came up with this design. Tested under harsh full auto conditions the RED doesn't disappoint. Keep your speed and accuracy up. Put more down range and on target. Try out the Fortis RED and let us know what you think Specifications for Fortis Manufacturing 5.56MM R.E.D. Barrel Muzzle Brake: Manufacturer: Fortis Manufacturing Caliber: .223 Remington 5.56x45mm NATO Gun Model: AR-15 Features of Fortis Manufacturing 5.56MM R.E.D. Barrel Muzzle Brake: 4140 Steel Nitride coated For the .223 / 5.56 1/2 x 28 TPI Comes with a crush washer 2.4 ounces 2.194 in Package Contents: Fortis Manufacturing 5.56MM R.E.D. Barrel Muzzle Brake What firearm models does the manufacturer say Fortis Manufacturing 5.56MM R.E.D. Barrel Muzzle Brake is compatible with? The manufacturer suggests that Fortis Manufacturing 5.56MM R.E.D. Barrel Muzzle Brake is compatible with AR-15Our Rapid Engagement Device or better known as the Fortis RED is a brake that stays true to our brand. We wanted to develop engineer and design a military grade accessory that not only functions great but looks great also. Tested and evaluated by people in the military and law enforcement community - then put to the test by members of the 3 gun community we came up with this design. Tested under harsh full auto conditions the RED doesn't disappoint.Keep your speed and accuracy up. Put more down range and on target. Try out the Fortis RED and let us know what you think Features/Specifications: 4140 SteelNitride coatedFor the 5.56 / .2231/2 x 28 TPI2.4 ounces2.194 inchesCrush washer includedmade in specialized factories Included Accessories: crush washer