LanTac USA LLC Dragon, Muzzle Brake, 9MM, Fits Sig MPX Pistol Only, Black Nitride Finish, Hardened Milspec Steel, M13.5X1LH Thread Pitch DGN9MMC LANTAC Dragon(R) Muzzle Brake DGN9MMC(TM) for 9x19MM SIG SAUER(R) MPX Rifles. Manufactured to the highest quality standards and featuring a patent pending design" the LANTAC DGN9MMC(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. PLEASE VERIFY THREAD PATTERN" some MPX models take different threads.