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FN FNX-40 .40 S&W
.40 S&W • FN America

FN FNX-40 .40 S&W

Model: 66876

10
CAPACITY
4.0"
BARREL
1.7
LBS
DA/SA
ACTION
.40 S&W
CALIBER
—
MSRP

Full Specifications

Action Type DA/SA
Trigger DA/SA Hammer-Fired
Trigger Pull DA 8.8–12.1 lb / SA 3.96–5.06 lb
Safety Ambidextrous Decock/Safety Lever
Optic Ready No
Magazines Included 3
Overall Length 7.4"
Barrel Length 4.0"
Height 5.4"
Width 1.55"
Weight 27.4 oz (1.71 lbs)
Frame Material Polymer (replaceable steel rails)
Frame Finish Matte Black
Slide Material Stainless Steel
Slide Finish Matte Black
Barrel Material Stainless Steel
Twist Rate 1:16" RH
Grip Type Polymer w/ interchangeable backstraps
Country of Origin USA

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

GOOD
Duty
FN points to the low bore axis as what holds a .40 down in the hand, and the stainless slide is cut with cocking serrations front and rear so it can be worked with gloves or wet hands.
GOOD
Competition
Running every control from either side means a left-handed shooter uses the gun as it comes, and the cold hammer-forged stainless barrel has a polished chamber and feed ramp behind it.
FAIR
Concealed Carry
Levers on both sides of the frame make this a wide pistol to cover, and a 5.4-inch grip height prints under anything thinner than a jacket.

Strengths & Limitations

Strengths
  • 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.
Limitations
  • 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.

Capacity
#10 of 11
Top 91%
10 rds
Weight
#1 of 11
Top 9%
1.7 lbs
Barrel
#10 of 11
Top 91%
4.0"
Trigger Pull
#2 of 11
Top 18%
4.0 lbs
Overall Length
#3 of 11
Top 27%
7.4"

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Where to Buy

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Alternatives to Consider

Similar full-size .40 S&W handguns ranked by similarity.

NAME BEST PRICE
Springfield Armory XD Service 4" .40 S&W
Springfield Armory
—
HK VP40 .40 S&W
Heckler & Koch
—
HK USP40 .40 S&W
Heckler & Koch
—
Sig Sauer P226 Elite .40 S&W
Sig Sauer
—
Beretta PX4 Storm .40 S&W
Beretta
—

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.