LANTAC Dragon(R) Muzzle Brake DGN9MMD(TM) for 9x19MM Rifles & Variants with 1/2 x 28 thread. Manufactured to the highest quality standards and featuring a patent pending design, the LANTAC DGN9MMD(TM) Muzzle Brake offers improved recoil management and muzzle rise over competitors products. Its unique Short Energy Pulse system reduces length of recoil so that repeating shot energy cannot overlap and knock the shooter off target. Full auto fire is possible with massively reduced recoil and muzzle climb, meaning that all shots fall on target.Features :1/2X28 Thread pitchSerial numbered for quality controlComes with crush washerHardened Milspec steel construction