Rock River Arms .223 Operator Muzzle Brake Black. 223 Operator Muzzle Brake then you have found yourself in the right location.. Formulated by using several of the most heavy duty and dependable materials around these Muzzle Brakes & Compensators by Rock River Arms offers you something that will give you many years of reliability. Rock River Arms has been making superior quality products for a very long time and the Rock River Arms .223 Operator Muzzle Brake is their way of revealing how much they are concerned. Right here at OpticsPlanet we ensure that it is our obligation to receive the best product for all your needs and presenting the Rock River Arms .223 Operator Muzzle Brake is one thing that we are delighted to offer. Specifications for Rock River Arms .223 Operator Muzzle Brake: Manufacturer: Rock River Arms Color: Black Projectile Caliber: .223 Caliber Threads per Inch: 1/2x28 Length: 2.25 in Weight: 3.1 oz Package Contents: Rock River Arms .223 Operator Muzzle Brake Rock River Arms AR0117OP: .223 Operator Muzzle Brake Black