The FN 509M Tactical is a striker-fired, polymer-frame semi-automatic pistol chambered in 9mm Luger. It ships with five magazines -- four 24-round and one 15-round -- and a threaded barrel ready for suppressor or compensator use. Suppressor-height tritium night sights come installed from the factory. 
 

Key Specifications 

• Model: FN 509 Midsize Tactical 
• Caliber: 9mm Luger (9x19 Para) 
• Barrel Length: 4.5 inches 
• Weight: 26.5 oz (1.7 lbs) 
• Capacity: 24+1 rounds 
• Finish Color: Black 
• Frame Material: Polymer 
• Action Type: Striker-fired, Semi-Auto 
• Overall Length (OAL): 7.9 inches 
• Muzzle Type: Threaded Barrel 
• Sights: Suppressor-height tritium night sights 
• Included Accessories: Five magazines (four 24 rd., one 15 rd.) 
   

Detailed Features 

The threaded barrel lets you mount a suppressor or compensator without gunsmithing. The suppressor-height night sights remain visible over a can when one is attached. The ambidextrous safety works for both left- and right-handed shooters. At 24+1 capacity the 509M Tactical carries significantly more than most midsize pistols in its class. 
 

Usage Scenarios 

The threaded barrel and high-capacity magazines make this a natural fit for home defense and any role where suppressor use is practical. The precision and good ergonomics translate to competitive shooting applications. For tactical use the 509M's reliability under varied conditions is its main credential.

The FN 509M Tactical 9mm draws consistent praise for build quality and reliability. Owners describe it as solid and well-fitted, and it holds up well across different shooting conditions -- which matters most to the users who run it hard.

Ergonomics get positive marks. The grip texture gives good control and the overall feel in hand is comfortable, which supports accurate shooting from the start. Accuracy at short and medium ranges is routinely described as reliable out of the box.

The threaded barrel is a genuine selling point for anyone who runs suppressors, and the 24+1 capacity is higher than most competitors in the midsize category. Those two features together drive a lot of the purchase decisions in the discussion threads.

Sights get mixed feedback -- some owners keep the factory-installed sights, others swap them for aftermarket options immediately. Price is cited as on the higher end, though most buyers who comment on it conclude the feature set justifies the cost. Aftermarket support is good: holsters, sights, and grips are readily available.