Zaffiri Precision Blowhole, Compensator, 9MM, Nitride Finish, Black, 1/2x28, For Glock 17/19/34 9mm Gen 1-5 ZP.COMP.BN Zaffiri Precision Blowhole Compensator is the perfect aftermarket addition for flatter shooting. The solid 17-4 stainless steel comp allows for not only gas redirection but less muzzle climb due to its weight. What does that mean for you?! Faster follow-up shots.