The FN 545 Tactical is a .45 ACP semi-automatic pistol with an 18+1 capacity, threaded barrel, tritium night sights, and an ambidextrous slide safety. It ships with one 15-round and one 18-round magazine. 
 

Key Specifications 

• Brand: FN 
• Model: 545 Tactical 
• UPC: 845737015664 
• Caliber: .45 ACP 
• Action Type: DAO (Double Action Only) 
• Barrel Length: 4.71 inches 
• Overall Length: 8.3 inches 
• Capacity: 18+1 rounds (includes 15-round and 18-round magazines) 
• Weight: 31 oz (1.9 lbs) 
• Finish: Matte Black Polymer Frame and Slide 
   

Detailed Features 

The striker-fired action delivers a consistent, predictable trigger pull. The threaded barrel at .578" x 28 accepts suppressors and muzzle devices. Tritium night sights on both front and rear positions allow accurate target acquisition in low light without battery-dependent illumination. The ambidextrous slide safety works for left- and right-handed shooters equally. At 31 oz, the 545 Tactical is heavier than many compact pistols, which helps manage the .45 ACP recoil impulse. 
 

Usage Scenarios 

1. Home Defense: High round count and .45 ACP caliber work well for defensive applications. 
2. Suppressed Shooting: Threaded barrel is the primary reason many buyers choose the Tactical variant. 
3. Competitive Shooting: Consistent trigger and night sight system are practical at the range.

The FN 545 Tactical is bought primarily by two groups: .45 ACP enthusiasts who want a modern, high-capacity platform, and suppressor owners who need a threaded barrel in that caliber. Both find what they're looking for. The 18-round magazine capacity is notable for a .45, and owners regularly mention it as a competitive advantage over traditional 1911-pattern guns.

Reliability and build quality reviews are positive across the board. The recoil management at 31 oz gets credit, and the night sights perform well in low-light practice. The threaded barrel and ambidextrous safety are functional rather than cosmetic.

The price draws some discussion. Most buyers consider it reasonable given the feature set — night sights, threaded barrel, and FN build quality don't come cheap. Aftermarket support is more limited than for Glock or M&P platforms, which is a consistent theme across FN products. Weight is occasionally flagged as a downside for all-day carry, though the 31 oz is in line with similarly equipped .45 pistols.