Strike Industries G4 Mass Driver Glock 17 Barrel Compensator - The Strike Industries Mass Driver Compensator is designed to reduce felt recoil and improve shooting control without requiring permanent modifications to compatible Glock pistols. Its innovative, slide-independent design promotes reliable performance, while the streamlined profile and integrated relief cut provide smooth, snag-free holster draws. Features Widened bore; 2.5mm relief cut at the top rear of comp; No permanent modification of weapon required; Blended, no snag profile; Matches with width of the slide; Counter recoil design; Contours with slide dimensions to be compatible with most open-bottom holsters; Precision CNC machined;