The Strike Industries Mass Driver compensator represents a quantum leap in compensator design. Current designs have largely been unchanged since the 1930s. It's about time for something revolutionary. The Mass Driver name is inspired by the idea of theoretical mass driver engines in space travel. By ejecting mass, an equal and opposite reaction is generated propelling the space vehicle forward. Features: No threaded barrel needed Matches with width of the slide, it can be used with open holsters, no special holster needed Counter recoil design, as the slide moves back the comp moves forward to reduce felt recoil Eliminates the need for threaded barrels, 50 state legal Blended, no snag profile Precision CNC machined No permanent modification of weapon required Contours with slide dimensions to be compatible with most open-bottom holsters