This compensator fits the Heckler & Koch P30L (Long) of all barrel lengths. The compensator has a fully open top to accommodate all barrel lengths, due to the fact that the barrel pitches when it is fired. From the standard full size (which achieves the most recoil reduction), to the tactical barrel (which achieves slightly less recoil reduction), to the match barrel length (which achieves the least recoil reduction). The compensator is m. Achined from Hot Rolled A36 Steel. And has cooling vents to help keep the temperature down and adds about 12 ounces of weight to the firearm. HK handgun and Rail light not included. You are purchasing the compensator only. If you have any questions please feel free to submit them.