Ruger 90486 Radial Ported Muzzle Brake AR-15 5.56 45mm NATO Black Oxide Steel with 1/2-28 tpi Threads 1.75″ OAL & .75″ Diameter”

Ruger’s .223 Rem/5.56 NATO Radial Port Muzzle Brake muzzle brake’s design reduces felt recoil and muzzle movement. 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 1/2″-28 muzzle threads. Made in the USA by Swan Manufacturing.”