The FN 545 Tactical is a DAO .45 ACP pistol with a 4.71-inch threaded barrel and 10+1 capacity. The thread pattern is .578x28 -- standard for .45 caliber suppressors. At 31 oz (approximately 1.9 lbs) and 8.3 inches overall, it's a full-size .45. Dovetail sights, matte black finish, and interchangeable backstraps. 
 

Key Specifications 

• Brand: FN 
• Model Name: 545 Tactical 
• Caliber: .45 ACP 
• Action Type: DAO (Double Action Only) 
• Capacity: 10+1 rounds 
• Barrel Length: 4.71 inches (threaded, .578x28) 
• Overall Length (OAL): 8.3 inches 
• Weight: 31 oz (approximately 1.9 lbs) 
• Sights Configuration: Dovetail 
• Grip Type: Black Interchangeable Backstrap 
• Safety Features: None 
• Finish Color: Matte Black 
   

Detailed Features 

 
The threaded barrel is the defining feature of the Tactical variant -- the .578x28 thread pattern is the standard for .45 ACP suppressors, so no adapter is required with most .45 cans. The DAO trigger fires the same weight on every shot with no external safety and no decocker; the trigger pull is the only safety mechanism. 
 
Dovetail-cut sights accept standard dovetail replacements without gunsmithing. The interchangeable backstrap system adjusts grip circumference for different hand sizes. The matte black finish is typical duty-grade coating. 
 
10+1 capacity in .45 ACP is standard for this platform and caliber. 
 

Usage 

• Suppressor host: the factory threaded barrel is the primary reason to choose the Tactical over the standard 545. 
• Duty carry: the DAO trigger with no external safety is the classic law enforcement configuration. 
• Home defense: .45 ACP with threaded barrel and 10+1 rounds.

The FN 545 Tactical gets specific interest from suppressor owners and .45 ACP enthusiasts, with discussions split between those two groups.

Positive feedback:

• The factory threaded barrel is the main draw -- most competing .45 ACP pistols require aftermarket barrel replacement or threading; the Tactical comes ready from the box.
• Build quality and reliability are well-regarded; FN's manufacturing standards are cited positively.
• DAO trigger consistency is appreciated by buyers who wanted a duty-style action without a manual safety.
• .45 ACP terminal performance and the dovetail sight cuts get positive mentions.

Common complaints:

• DAO trigger divides opinion -- buyers who prefer striker-fired or SA/DA triggers find the heavy consistent pull a mismatch for their shooting style.
• 10+1 capacity is lower than comparable 9mm pistols, and .45 ACP magazines are larger, which limits concealment.
• Recoil is manageable but heavier than 9mm, which is worth noting for new shooters.
• Price is on the higher end for a .45 ACP pistol; competition from 1911-pattern .45s and the Sig P227 comes up in comparisons.