Machined from stainless steel and coated with a robust PVD finish, the compensator is extremely durable and is designed to withstand hard use across standard and self-defense loads for the widest degree of compatibility, while still utilizing the factory FN 509® recoil spring. FN Compensator Accessory Kit is available in models compatible with FN 509 Standard, Midsize and Compact models. It ships with the compensator and proprietary non-threaded QD barrel. Upgrade your FN 509 with the cutting edge of performance with the FN Compensator Accessory Kit. First introduced on the FN 509 CC Edge, the compensator’s unique quick-detach (QD) design allows for toolless install and removal from the proprietary non-threaded QD barrel in a matter of minutes, no gunsmith or factory service required. The FN Compensator significantly decreases felt recoil and features v-style ports on either side that vector gases and flash out of the user’s field of view. The result is a shooting experience that is flatter and more controlled, allowing users to maintain a consistent sight picture from shot to shot. Specifications for FN 509 Compact Compensated Barrel Kit: Manufacturer: FN America Color: Black Caliber: 9mm Luger Condition: New Features of FN 509 Compact Compensated Barrel Kit: Reduces muzzle rise up to 25% No shims or threading required Reduces felt recoil Helps with follow-up shot speed Directs muzzle blast up and outward to prevent sight obstruction Easy takedown and cleaning Package Content: FN 509 Compact Compensated Barrel Kit