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The 90486 model by Ruger is a Radial Port Muzzle Brake designed for .223 Rem/5.56 NATO. This specific muzzle brake design assures the reduction of felt recoil and muzzle movement. It can be easily installed using an 11/16" open-end wrench or crescent wrench. To properly secure it, torque the brake to 15-20 ft-lbs - no requirement for crush washers.
It's important to note that this brake is compatible with AR-556 rifles along with other firearms that operate with .223 Rem/5.56 NATO caliber, provided they have 1/2"-28 muzzle threads. Swan Manufacturing, located in the USA, is responsible for the production of this item.