FN FNX-40 .40 S&W
Model: 66876
FN FNX-40 .40 S&W
Model: 66876
Full Specifications
About This Firearm
The FN FNX-40 is a full-size DA/SA hammer-fired .40 with one of the most aggressive feature sets ever built into a polymer service pistol. Capacity sits at 14+1, the barrel is 4", and the weight is 27.4 oz empty — light for a metal-slide DA/SA gun, since the steel internal rails ride in a polymer frame.
Where the FNX stands apart from Sig P320 and S&W M&P 40 M2.0 peers is the control layout: ambidextrous decocker, manual safety, slide stop, and magazine release. Lefties get a true mirror-image gun, and right-handed shooters get redundant controls for malfunction work. The 4 lb single-action pull is at the lighter end for a duty DA/SA, the rear sight and slide both have a Picatinny-spec rail, and the steel rail inserts in the polymer frame address the long-running concern about polymer-on-steel slide wear under high round counts.
FN discontinued the FNX-40 in 2020 as part of the company's broader move toward the FN 509 striker platform. Used FNX-40 examples remain common on the secondary market, and FN America still supports the gun for parts and warranty work. The FNX line also includes the FNX-45 Tactical, which kept the same control geometry and is still in production — so muscle memory carries over for buyers who add the .45 Tactical to a collection.
Best For
Strengths & Limitations
- Truly ambidextrous controls — decocker, safety, slide stop, and mag release all mirrored — set the FNX-40 apart from any current striker .40
- Steel rail inserts in the polymer frame address polymer-frame slide-wear concerns that plague some all-polymer designs
- 4 lb single-action pull is on the lighter end for a duty DA/SA, well below most striker .40 trigger pulls
- Discontinued by FN in 2020; new-old-stock and used examples only, with no factory new production resuming
- Aftermarket support (holsters, sights, parts) is narrower than for Glock or M&P platforms and continues to shrink
- Heavy DA first-shot pull catches inexperienced shooters; not the right gun for someone unwilling to train DA/SA transitions
Category Rankings
How the FN FNX-40 .40 S&W ranks among full-size .40 S&W handguns.
Ballistics Calculator
Calculate trajectory, drop, and energy for .40 S&W ammunition.
.40 S&W Ballistics →Where to Buy
No prices available at this time.
Alternatives to Consider
Similar full-size .40 S&W handguns ranked by similarity.
| NAME | BEST PRICE |
|---|---|
|
Beretta PX4 Storm .40 S&W
Beretta
|
— |
|
Sig Sauer P320 .40 S&W
Sig Sauer
|
— |
|
Glock G35 Gen5 MOS .40 S&W
Glock
|
— |
|
HK USP40 .40 S&W
Heckler & Koch
|
— |
|
Glock G22 Gen5 .40 S&W
Glock
|
— |
Frequently Asked Questions
Does FN still service the FNX-40 under warranty?
Yes — FN America continues to honor warranty service and parts orders for the FNX-40 despite the gun being out of production since 2020. Recoil springs, magazines, and small parts are still in stock at FN's customer service department, though buyers should expect that to taper off over the next several years as parts inventory depletes.
Will FNX-45 Tactical magazines work in the FNX-40?
No — the FNX-45 uses a wider magazine body to fit .45 ACP rounds, and the magazine wells are not interchangeable. The FNX-40 takes FNX-40 specific magazines only. The FNS-40 striker pistol shares some parts with the FNX-40, but the magazines are also not cross-compatible due to feed-lip differences between hammer and striker variants.
