I purchased this for a RRA 7 1/2 barrel pistol ,I have tried several different compensators, muzzle brakes to get that heavy muzzle blast from coming backward ,or even to the side , this one from M.I. was spot on correct ,every round fired was just like shooting a standard 16 inch carbine it kept all the muzzle blast out front away from your face and optics ,which was on of the problems I had ,the muzzle blast was so much it turned the crosshairs of the optic ,not to mention you could feel it on your face ,this diverter works great ,finally some one got it right . If you own a AR pistol this is a must have ,also its small ,and a low price .