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That 3.7" in the title is incorrect. This is for the 4.32" Barrel. Searching the UPC you will find it is for the 4.32". UPC 845737012205 MPN 66100803 Brand FN Main Model FN 509 Compact Tactical Model 509 Compact Tactical Caliber 9mm Luger Capacity 10+1 Type Pistol Action Semi Auto Safety Loaded Chamber Indicator Barrel Length 4.32" Overall Length 7.4" Weight 26.2 oz

Good evening to you!! The FN 509 Compact Tactical Specs as follows : Specs Caliber: 9mm Operation: Double-action Mag Capacity: 10 or 12/24 Rd. Weight: 26.2 oz. Barrel Length: 4.32" Overall Length: 7.4" Twist Rate: 1:10" RH Height: 5.3" Width: 1.35" Trigger Pull: 5.5 - 7.7 lb. Sight Radius: 5.6" Primary Features Striker-fired autoloader 5.5 to 7.7 lbs. Trigger pull FN Low Profile Optics Mounting System™ Threaded Barrel Suppressor Height Trijicon 3-Dot Green Tritium Night Sights SLIDE FN Low Profile Optics Mounting System™ Sight Protecting Slide Cap External extractor; loaded chamber indicator BARREL Cold hammer-forged stainless steel Recessed target crown Polished chamber and feed ramp 1/2" x 28 threaded Barrel O-Ring retention thread cap FRAME Polymer construction with replaceable steel frame/slide rails Enhanced grip texture which enables faster follow-up shots in all conditions Interchangeable backstraps MIL-STD-1913 accessory mounting rail OPERATING CONTROLS Fully ambidextrous slide