Small .223 / 5.56 Linear Compensator for use on short barreled and regular length rifles.The slim line design with inside expansion chamber leads blast and noise straight forward to increase shooting comfort and reduce noise at the shooters ears.Specifications:Available with A 1/2 x 28 threadCal.223REM / 5.56 x 45 with Barrel Threads in 1/2x28TPIBlack Version4140 SteelLength: 2.94"Width: .98"Outer diameter .975"