Ultra-compact single-port design for the Plan B mounting system. The Breek Arms Plan B Echo Single-Port Muzzle Brake significantly reduces recoil and muzzle rise through 90Adeg horizontal blast-vectoring ports -keeping your rifle flat, fast, and ready for seamless suppressor swaps.Weight: 2.3oz (223/556), 2.0oz (30 cal)Overall Length: 1.75"Material: 4140 Hardened Steel, NitrideThread Pitch: 1/2x28TPI (223/556), 5/8x24TPI (30 cal)Caliber: 223/5.56, 30 calSuppressor Mount: Plan B / AtlasTorque Spec: 20-30 ft lbsPeel Washer IncludedDesigned & Manufactured in AmericaRequires a 13/16" wrench to install