FN America FN 509 Compact 9mm Compensated Pistol Barrel Kit, 4.34in, 1-10 Twist, Black/Flat Dark Earth, 20100807

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.