FN FNX-45 Tactical 45 ACP 5.3in Threaded Barrel – 2x15rd

Description

The FN FNX-45 Tactical .45 ACP 5.3in threaded barrel – 2x15rd is a full-size semi-auto handgun built for shooters who demand suppressor-ready performance, optic compatibility, and ambidextrous controls straight from the factory. Chambered in .45 ACP, this pistol pairs a cold hammer-forged stainless steel threaded barrel with an optic-ready, serrated slide for fast target acquisition and reliable cycling. The polymer frame includes interchangeable backstraps and a MIL-STD-1913 accessory rail for mounting lights or lasers. High-profile night sights and ambidextrous controls make it equally effective for right and left-handed shooters. Whether you’re running suppressed, competing, or training, this FN delivers the accuracy and durability you expect from a duty-grade .45.

Manufacturer	FN America
Model	FNX-45 Tactical
Material	Cold hammer-forged stainless steel barrel, polymer frame (per manufacturer specs)
Compatibility	Suppressor-ready with 5.3in threaded barrel; accepts most red dot optics with included mounting plates
Finish	Black nitride slide, black polymer frame
Weight	33.6 oz (unloaded, per manufacturer specs)
Condition	New

Key Features

• Cold Hammer-Forged Threaded Barrel — The 5.3-inch stainless steel barrel is cold hammer-forged for extended service life and precision, then threaded (1/2×28) to accept suppressors or compensators without a gunsmith.
• Optic-Ready Slide with Serrations — The slide is pre-milled for popular red dot footprints and includes four mounting plates. Aggressive serrations give you a solid grip for press checks or slide manipulation.
• Ambidextrous Controls — Slide stop, magazine release, and decocker/safety are duplicated on both sides, so left-handed shooters get the same speed and access as right-handed users.
• High-Profile Night Sights — Three-dot tritium night sights provide low-light visibility and co-witness through most red dot optics, keeping you on target when the lights go out.
• MIL-STD-1913 Accessory Rail — The polymer frame integrates a full-length rail for mounting weapon lights or lasers without adapters, supporting duty or home-defense setups.

Who It’s For

This pistol is for shooters who want a factory-ready suppressor host with optic compatibility and ambidextrous controls. It fits duty professionals, competition shooters, and enthusiasts who prefer .45 ACP for its terminal performance. If you need a handgun that works out of the box with a suppressor, red dot, and light, the FNX-45 Tactical is your answer.

Pros & Cons

• Pro: Factory threaded barrel and optic cut eliminate aftermarket costs and fitting.
• Pro: Ambidextrous controls make it a true ambi gun, not just a reversible magazine release.
• Pro: 15-round magazine capacity in .45 ACP is among the highest in its class.
• Con: The slide is tall and heavy, which can slow cycling with certain low-power .45 loads; a recoil spring upgrade may be needed for consistent suppressed use.

Comparison

Feature	FN FNX-45 Tactical	Zev Technologies OZ9	Geissele Automatics Super Duty 1911
Caliber	.45 ACP	9mm	.45 ACP
Barrel	5.3in threaded, cold hammer-forged	4.5in threaded, match-grade	5in non-threaded, match-grade
Optic Ready	Yes, multi-footprint plates	Yes, RMR cut	No
Capacity	15+1	15+1 (9mm)	8+1
Ambidextrous	Full ambi controls	Ambi slide stop only	No
Price	$1,217.30	$1,899	$2,495

FAQ

What thread pitch is the barrel?

The FN FNX-45 Tactical barrel uses a 1/2×28 thread pitch, which is the standard for .45 ACP suppressors and compensators. Most aftermarket muzzle devices in this caliber will fit without adapters.

Can I mount a red dot without buying extra plates?

Yes. The slide comes with four mounting plates that cover most popular footprints, including Trijicon RMR, Leupold DeltaPoint Pro, and Docter/Noblex. You only need an Allen wrench to swap plates.

Does this model work with a suppressor out of the box?

Yes, the factory threaded barrel and tall night sights allow direct suppressor mounting and co-witness. Per FN specs, the pistol is designed for suppressed use with standard recoil springs, but some shooters prefer a heavier spring for consistent cycling with subsonic loads.

What is the magazine capacity?

It ships with two 15-round magazines. The FNX-45 Tactical holds 15+1 rounds of .45 ACP, which is the highest standard capacity for a production .45 pistol.

Trust & Delivery

• ✔ Nationwide delivery (all 50 states)
• ✔ Ships 1-2 business days
• ✔ 30-day returns
• ✔ Secure checkout

Browse more Semi Auto Handguns or check out our Firearms and FN Products. Last updated: April 2026.