The FN 509 Tactical is a full-size striker-fired semi-automatic pistol chambered in 9mm with a 24+1 round capacity and a Flat Dark Earth finish. The DAO trigger has a pull weight between 5.5 and 7.5 lbs. At 7.9 inches overall and 27.9 oz unloaded, it is not a compact carry pistol but it handles well at the range. 
 

Key Specifications 

• Brand: FN America 
• Model Name: 509 Tactical 
• Caliber: 9mm Luger 
• Action: Double Action Only (DAO) 
• Capacity: 24+1 rounds 
• Barrel Length: 4.5 inches 
• Overall Length: 7.9 inches 
• Weight: 27.9 oz (approx. 1.75 lbs) 
• Sights: Suppressor Height Trijicon Fixed Night Sights (3-Dot) 
• Grip Material: FDE Checkered Polymer 
• Finish: Flat Dark Earth 
• Safety Features: No Manual Safety (NMS) 
   

Detailed Features 

1. The striker-fired mechanism delivers a consistent trigger pull between 5.5 and 7.5 lbs across rapid firing sequences. 
2. The threaded barrel accepts suppressors and muzzle devices without an adapter. 
3. The Low Profile Optics Mounting System mounts optics directly to the slide without extra adapters. 
4. Interchangeable backstraps let you adjust grip size for better control. 
5. Aggressive grip texture improves purchase in wet or adverse conditions. 
    

Target Audience 

Self-defense buyers who want a high-capacity 9mm with suppressor capability, competitive shooters who run optic-equipped pistols, and tactical users who need a platform that can adapt across different roles. 
 

Usage Scenarios 

At home the 24+1 capacity and night sights cover low-light defense scenarios well. On the range the optic-ready slide and consistent trigger make it a capable competition pistol. The threaded barrel adds suppressor compatibility for those with the appropriate tax stamp.

The FN 509 Tactical in 9mm FDE gets a lot of attention in forums and reviews, and the feedback covers several consistent themes.

Users who shoot it regularly point to ergonomics first: the grip texture is well-regarded and the gun sits naturally in the hand. Capacity is another frequent highlight - 24+1 rounds matters to competitive shooters and home-defense buyers alike. Accuracy reports are generally good across distances. The suppressor-height Trijicon night sights work well in low light, and the optics mounting system is cleaner than adapter-based solutions on competing platforms. Build quality is praised consistently.

The complaints are also consistent. At 27.9 oz unloaded the 509 Tactical is noticeably heavy compared to lighter polymer-framed 9mms, which makes it awkward for concealed carry. The DAO trigger draws mixed reactions: some shooters are fine with the pull weight and reset, others find it heavier and less crisp than they'd prefer. Price compared to competitors with similar specs comes up regularly. Magazine cost and parts availability are minor secondary complaints.