BREEK ARMS PLAN B ECHO 5.56 NATO SINGLE PORT MUZZLE BRAKE 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. SPECS Weight: 2.3 oz Overall Length: 1.75" Material: 4140 Hardened Steel, Nitride Thread Pitch: 1/2 x 28 TPI Caliber: 223/5.56 Fast attach for Plan B suppressor mounts Mfg: Breek Arms