FN 509 Compact 9mm Compensated Pistol Barrel Kit 4.34in 1-10 Twist Black EE

FN 509 Compact 9mm Compensated Pistol Barrel Kit 4.34in 1-10 Twist Black EE. 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 compensators unique quick-detach (QD) design allows for toolless install and removal from the propriet