The HKP HK Mark 23 Gen 2 Rail Mount Compensator in black is a high-quality accessory designed specifically for Heckler & Koch handguns. Made in the United States, this compensator is tailored for. 45 ACP handguns and provides a stable and accurate shooting experience. Perfect for sport shooting and hunting, this rail mount compensator ensures precise and reliable performance for your firearm. See pictures and HK website for more details.