The Shadow Systems thread on compensator is designed to interface perfectly with existing MR920, DR920, and XR920 slide designs. The compensator will significantly improve shot-to-shot times and lessen felt recoil. The clamping system is rock solid yet avoids the common issue of damage to the threaded section of your barrel. The conservatively designed port size ensures reliability with full power ammunition and limits muzzle blast to the sides of the pistol. Note: The Geometry of the compensator is design to interface with Shadow Systems MR920/DR920/XR920 Slides, it will make contact and potentially cause damage to MR918 Series and other manufacture slides.