- The FN 509 Compact represents the next evolution in personal protection with the performance of a full-sized pistol in a concealable size. With low-profile, snag-free sights, it’s the right addition for every day carry and the perfect fit for in-the-waist holsters. The improved controls aid in manipulation, the new improved texturing on the two included backstraps provides better recoil management, and a new flatter faced trigger enhances trigger control with a cleaner break.