Shadow Systems MR920P Elite 9mm Luger 4.25in Black Nitride Pistol - 17+1 Rounds - The MR-P and XR-P feature an all-steel compensator which directs propellent gasses upward and keeps the gun on target. Shadow Systems compensated guns are designed to function in adverse conditions. Shadow Systems prioritize reliability but still provide the most controllable, easiest to hit with pistols on the market. The MR-P and XR-P compensator is a highly compact steel compensator that adds only ½ inch to the pistol. Consequently, both guns fit in existing G17 holsters. The compensator uses the patent pending QD attachment system found on the successful CR-P pistol. This allows for ease of maintenance and sales in jurisdictions that ban threaded barrels. With this design, Shadow Systems eliminated the use of a conventional threaded barrel. Instead, Shadow Systems developed a proprietary 3-lug muzzle that works in combination with a centrally located locking lever in the body of the comp.