The LANTAC Dragon Muzzle Brake 9mm 1/2x28 features a unique Short Energy Pulse system designed to reduce recoil and improve accuracy on repeating shots. Constructed of hardened MIL-SPEC steel with a phosphate finish and comes with the appropriate crush washer.Features: 9x19mm Caliber California legal - Not considered a flash hider Steel construction with a phosphate finish 1/2-28 UNEF R/H thread Crush washer included Made in the U.S.A.Lantac USA manufactures the highest quality accessories for AR-15/M16 pattern rifles. Precision made in the U.S.A., rifles, muzzle brakes and more.