The FN FNX is a .45 ACP semi-automatic pistol with DASA (Double Action/Single Action) operation, 10+1 capacity, and a 5.3-inch cold hammer-forged barrel. Suppressor-height night sights aid target acquisition in low-light conditions. The slide is optics-ready, compatible with the Vortex Viper RDS. The ambidextrous decocker is the primary safety feature. Finish is matte black. The black interchangeable backstrap grip accommodates different hand sizes. 
 

Key Specifications 

• SKU: 3457043 
• UPC: 845737012366 
• Brand: FN 
• Model Name: FNX 
• MPN: 66100865 
• Caliber: .45 ACP 
• Action: DASA (Double Action/Single Action) 
• Capacity: 10+1 rounds 
• Barrel Length: 5.3 inches 
• Sights: Night sights with suppressor height 
• Grip: Black interchangeable backstrap 
• Trigger: Standard 
• Safety Features: Ambidextrous decocker 
• Finish: Matte black 
• Condition: New in box 
   

Detailed Features 

 
The cold hammer-forged barrel produces consistent accuracy and holds up well over time. Suppressor-height night sights keep the sight picture usable even with a can mounted. Vortex Viper RDS compatibility is built in, no milling required. The ambidextrous decocker makes the transition between DA and SA straightforward for either hand. Interchangeable backstraps let you dial in the grip fit before heading to the range. 
 

Target Audience 

 
Personal defense buyers who want .45 ACP stopping power with modern features. Competitive shooters who need an accurate barrel and smooth action. Law enforcement looking for a reliable full-size sidearm with ambidextrous controls. 
 

Usage Scenarios 

 
The suppressor-height night sights and optics compatibility make this well-configured for low-light or duty use. The 5.3-inch barrel and DA/SA action suit competition shooting well. For home defense, the .45 ACP caliber and 10+1 capacity cover most scenarios adequately.

The FNX-45 Tactical NightSight draws solid praise on construction and practical features, with weight and trigger pull as the recurring criticisms.

Build quality and reliability are the most-cited strengths. Owners consistently note that it holds up well under adverse conditions, which drives confidence in day-to-day and duty use. Ergonomics are generally well-regarded: comfortable grip, intuitive controls, and easy handling through extended sessions. Accuracy gets strong reviews, especially when using quality ammunition, and the adjustable sights contribute to that. The threaded barrel for suppressor use is a notable plus for those who run cans. Night sights are appreciated for low-light usability.

Weight and size are the most common negatives. The FNX-45 is on the heavier and bulkier side for a carry gun, which affects concealment. Trigger pull gets mixed feedback: most find it workable, but some consider it heavier or less refined than they'd prefer. Price is occasionally noted as high relative to comparable models. The 10+1 capacity in .45 ACP is standard for the caliber but some shooters wish for more rounds or extra magazines included.

The FNX-45 Tactical is generally viewed as a capable and reliable tactical pistol with clear trade-offs in weight and cost.