FN 509 Midsize Tactical 9mm FDE w/ PMM Micro Compensator & Optics-Ready Slide
This FN 509 Midsize Tactical pairs the battle-proven 509 platform with Parker Mountain Machine’s micro compensator, giving you a controllable, suppressor-ready 9mm in a compact, duty-grade package. Factory Flat Dark Earth coloring, an optics-ready slide, and fully ambidextrous controls make this pistol stand out for shooters who want modern features without adding bulk.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent – Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling – Sharp lands and grooves.
Specific Condition Notes: Light scuffing is present along the frame surfaces.
What’s Included
- FN-branded Flat Dark Earth soft pistol case
- Factory cardboard box
- FN Low-Profile Optics-Mounting System plates, screws, and tools (sealed parts kit)
- Spare interchangeable FDE backstrap
- Factory paperwork/manuals
- One 24-round extended FN steel magazine with orange follower
- One 15-round flush-fit FN steel magazine with orange follower
The Parker Mountain Machine micro compensator threads directly to the cold-hammer-forged, 4.5-inch stainless barrel (1/2x28 TPI), trimming recoil and muzzle rise without adding noticeable length. Because the compensator attaches to the factory-threaded barrel, you can remove it and still run a suppressor or other muzzle device.
FN’s Low-Profile Optics-Mounting System comes with adapter plates that fit more than ten popular micro red-dot footprints, so you can install an optic without a gunsmith. Tall tritium 3-dot night sights co-witness through most dots and remain visible in low light.
The midsize grip accepts both 15- and 24-round magazines; this listing includes one of each. Interchangeable backstraps let you fine-tune reach to the flat-faced, duty weight, striker-fired trigger. A reversible magazine release and fully ambidextrous slide stop support both left- and right-hand shooters.
Finished in a PVD Flat Dark Earth coating over the slide and polymer frame, the pistol is built for corrosion resistance and blends seamlessly with modern duty gear. An accessory rail out front keeps lights or lasers aligned.