The FN 545 Tactical is a semi-automatic pistol chambered in .45 ACP with a DAO trigger, a 4.71" cold hammer-forged threaded barrel, and 10+1 capacity. Weight is 31 oz (1.94 lbs). The finish is Flat Dark Earth with an FDE interchangeable backstrap grip. The barrel is threaded at .578x28 and target-crowned. Sights are dovetail-mounted steel with tritium lamps, co-witnessing with micro red dot optics via the factory low-profile optics mounting system. 
 

Key Specifications 

• Brand: FN 
• Model Name: 545 Tactical 
• Caliber: .45 ACP 
• Action: Double Action Only (DAO) 
• Capacity: 10+1 rounds 
• Barrel Length: 4.71 inches (threaded, .578x28) 
• Overall Length: 8.3 inches 
• Weight: 31 oz (1.94 lbs) 
• Sights: Dovetail steel sights with tritium lamps 
• Grip: FDE Interchangeable Backstrap 
• Safety: No manual safety 
• Finish: Flat Dark Earth (FDE) 
• Optics: Low-profile mounting system; co-witnesses with micro red dots 
   

Detailed Features 

The low-profile optics mounting system accepts most micro red dot optics without gunsmithing. The 4.71" cold hammer-forged barrel has a target crown and ships threaded at .578x28 for suppressors or compensators. Tritium lamp sights provide low-light aiming backup when an optic is installed. No manual safety keeps the manual of arms simple for the DAO trigger. The ambidextrous controls accommodate both hand orientations. The FDE interchangeable backstraps adjust grip size. 
 

Usage 

The FN 545 Tactical is optics-ready out of the box, which is its key differentiator in the .45 ACP full-size market. It fits home defense, competition, and tactical duty roles. The DAO trigger and no-manual-safety design simplifies carry and deployment. The threaded barrel adds suppressor or compensator capability.

Owners of the FN 545 Tactical generally appreciate it as an optics-ready .45 ACP option with a factory threaded barrel — a combination that few .45 ACP pistols offer at this price tier.

Build quality and ergonomics get consistent praise. The FDE finish, grip feel, and ambidextrous controls are mentioned positively. The cold hammer-forged barrel and low-profile optics system are highlighted as practical features that reduce the need for aftermarket modifications.

The DAO trigger generates discussion. Some users appreciate the consistent long pull for a carry gun without a manual safety; others would prefer a striker-fire or SA/DA system. This is an inherent platform characteristic rather than a defect.

Recoil with .45 ACP loads is noted as present but manageable at 31 oz. The 10+1 capacity is the standard trade-off for .45 ACP bore diameter.

Price is debated. Some feel the feature set — factory optics cut, threaded barrel, tritium sights — justifies the cost; others compare it unfavorably against competitors offering higher capacity at lower prices. Aftermarket support for FN accessories is narrower than for the most common platforms.