The Strike Industries Mass Driver Compensator (MDC) represents a quantum leap in compensator design. 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. The Mass Driver Compensator is driven by the hot gasses expelled through the barrel after the round is discharged and acts as a counter balance system to attenuate mechanical recoil. Barrel mounted compensators add reciprocating mass and increase the moment of inertia to the operating system which can have a negative effect on reliable cycling of recoil operated handguns. By separating the compensator from the operating components after ignition the MDC allows for close to stock cyclic speeds and reduces reciprocating mass. The compensator of the MDC system has a widened bore to reduce baffle strikes and keyholing rounds along with a 2.5mm relief cut at the top of the rear to reduce lipping and damage to the face of the pistol slide. Includes: x1 Comp main body x1 Recoil spring x1 Guide rod x1 Guide rod fitment washer x1 Guide rod head x1 Internal spring x1 Guide rod plug (GEN4 only) x1 Warning card