This .223 Rem / 5.56 NATO Radial Port Muzzle Brake muzzle brake's design reduces felt recoil and muzzle movement. It is made from alloy steel with a black oxide finish to complement most firearms. Installs with a 11/16" open end wrench or crescent wrench.

• Torque the brake to 15-20 ft-lbs. – no crush washers are required
• This brake is compatible with AR-556® rifles and other .223 Rem / 5.56 NATO caliber firearms with ½-28 muzzle threads"
• Dimensions: 1-3/4 length, .75" diameter"
• Weight: 1.7 ounces
• Made in the USA by Swan Manufacturing.