Foxtrot Mike's Premium Micro 9mm Blast Diffuser re-directs the concussive blast of 9mm P.C.C.'s forward, reducinggasses felt by shooters to the left/right. Helps reduce dust signatures when shooting prone too. The 9mm Micro BlastDiffuser sends spent gasses forward, away from your shooting partners. Elegant design allows for simple installation, byusing a 7/8" socket. Easily achieve appropriate torque when using a 7/8" socket and torque wrench.