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 polymer-framed DA/SA .40 S&W built for duty and competition. FN no longer makes it, so it's a used buy. Every control on it works from both sides, the decocking and safety lever, the slide stop and the magazine release, and three magazines came in the box.
Magazines came in 10- and 14-round forms, and the gun shipped with two interchangeable backstraps carrying lanyard eyelets. The polymer frame holds replaceable steel rails, so the surfaces the slide runs on can be renewed. The slide was never cut for an optic. At 7.4 inches long and 1.55 inches across on a 4.0-inch barrel, this is a full-size duty pistol.
If you're cross-shopping, the Glock G22 Gen5 is still in production, holds 15 rounds at 28.43 oz on a 4.49-inch barrel and also ships with three magazines, though its trigger weighs the same on every shot. The Beretta PX4 Storm covers the DA/SA side with a staggered 14-round magazine and a 4.02-inch barrel, and it puts the decocking lever on the slide where FN puts it on the frame.
Best For
Strengths & Limitations
- The steel frame rails are replaceable, so a high-mileage pistol can be repaired.
- Three magazines came with the gun, so there was never a spare to buy.
- The slide is stainless steel, which on a used duty gun means less to worry about where the finish has worn through.
- It is out of production, so magazines, backstraps and springs come from used and surplus supply.
- There is no optic cut, and putting a dot on a .40 duty gun now means paying for milling.
- Two backstraps is the whole fit adjustment, so a hand between the two sizes has no third option.
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
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Beretta PX4 Storm .40 S&W
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Frequently Asked Questions
Were night sights available?
Yes. FN offered fixed three-dot green tritium night sights alongside the standard fixed three-dot set, so a used example may have either.
Is it made in the USA?
Yes. FN states that every FNX is made in the USA.
What is the barrel twist?
1:16 right hand, in a cold hammer-forged stainless barrel.