FN FNS

The FN FNS is a striker-fired semi-automatic pistol platform from FN America, available in 9mm (FNS-9, 17+1 capacity) and .40 S&W (FNS-40, 14+1 capacity). Both variants share the same fully ambidextrous control layout, cold-hammer-forged barrel, and the robust construction that characterizes FN’s military and law enforcement products. Built before FN shifted development focus to the FN 509, the FNS remains a capable and reliable duty pistol.

Read our full FN FNS Buying Guide ↓

FNS-9 vs. FNS-40: Choosing Your Caliber

The FNS-9 and FNS-40 share the same frame, trigger system, and ambidextrous controls—the difference is caliber and capacity. The FNS-9 holds 17+1 rounds of 9mm, making it one of the higher-capacity full-size duty pistols available at its price. The FNS-40 holds 14+1 rounds of .40 S&W, a caliber that still sees agency use and offers more energy per round than standard-pressure 9mm. Both use the same holster platform and have the same handling characteristics. For most buyers, the FNS-9 is the stronger choice given modern 9mm’s terminal performance parity with .40 S&W, lower ammunition cost, and higher capacity. For shooters already committed to .40 S&W or whose agency issues it, the FNS-40 is an equally capable platform.

FNS Ambidextrous Controls: A Genuine Advantage

The FNS’s fully ambidextrous controls are one of its strongest practical features. The magazine release is reversible for left-handed use; the slide stop levers are duplicated on both sides of the frame. All controls function identically from either hand without modification—genuine ambidextrous design rather than the partial solutions common on many pistols. For left-handed shooters or agencies that need a single platform that works equally for all officers, the FNS’s controls are a meaningful practical advantage over guns like the Glock that require aftermarket modification for full left-hand ergonomics.

FNS vs. FN 509: How They Compare

The FN 509 is FN’s current flagship striker-fired platform, introduced after the FNS and featuring an optics-ready slide on MRD variants, improved ergonomics, and a more refined trigger. The FNS predates the 509 and lacks a factory optic cut. For a buyer who wants FN’s most current and supported striker-fired pistol, the 509 is the right choice. For a buyer who finds an FNS at a competitive price and doesn’t require an optic cut, the FNS remains a fully capable and reliable pistol—FN’s build quality ensures it will outlast many guns with more modern feature sets.

FNS Compact Variants

FN also produced the FNS in compact configurations: the FNS-9C (3.6″ barrel, 12+1 or 17+1 with full-size magazine) and FNS-40C. The compact variants use the same action and control layout as the full-size guns in a more carry-friendly package. Full-size FNS magazines function in the compact models as extended reloads, providing a capacity equal to the full-size gun when needed. The compact is the more commonly carried variant; the full-size is better suited to duty and range use.

FNS Trigger and Accuracy

The FNS uses a striker-fired trigger with a consistent pull of approximately 5.5–7.5 lbs and a short reset. Most shooters describe the feel as smooth and predictable—not as light as the Walther PPQ but fully adequate for duty use and accurate shooting. FN’s cold-hammer-forged barrel and tight manufacturing tolerances produce good mechanical accuracy; most FNS pistols group under 3″ at 25 yards from a rest with standard ammunition. The fixed barrel design contributes to shot-to-shot consistency.

Browse all FN America firearms, compare with the current FN 509, or explore our full concealed carry selection.