The FN 509 is a full-size polymer-framed, striker-fired pistol using a frame with enhanced grip textures which enables faster follow-up shots in all conditions. The grip has an enhanced grip texture which enables faster follow-up shots and interchangeable backstraps adapted to all hand sizes. The slide and grip feature highly effective non-slip surfaces; magazine catch, slide release and safety catch are fully ambidextrous. This autoloading pistol with a preloaded striker mechanism has been tested successfully with a large number of 9x19mm ammunition types including FN® EP and EPT cartridges. The FN® 509 also features a tactile and visible loaded chamber indicator and a 17-round capacity magazine allowing for visual instant ammo check. The FN 509 does not have a manual safety, but a non-manual safety works in conjunction with passive safeties for safe operation. The FN 509 has a height of 139mm, an overal length of 188m long with a 101.66mm barrel, and an approx. weight of 753 gr. with an empty magazine, and approx. 957 gr loaded. The FN 509 uses a cold-hammer-forged stainless steel barrel with polished chamber and feed ramp.
The FN 509 has a frame with enhanced grip textures which enables faster follow-up shots in all conditions.