FN America 509 Compact MRD Compensated 9mm Pistol, 4.2″ Barrel
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$1,109.00Original price was: $1,109.00.$899.00Current price is: $899.00.
🚚 Ships to your local FFL — order online, put your FFL dealer’s name and address in the Order notes box at checkout, and we coordinate the rest. Most firearms ship same or next business day. How buying a gun online works.
FN America 509 Compact MRD Compensated is a compact 9mm semi-auto pistol with a 4.2" compensated barrel and a 12-round capacity. It is for shooters who want a compact, optics-ready 9mm for carry, range time or home defense.
9mm semi-auto pistol
4.2" compensated barrel
12-round capacity
Compact polymer frame
Matte slide finish
Optics-ready sights
SKU: ORN-FN66-101794 · Mfr part #: 66-101794 · UPC: 845737017842
The FN America 509 Compact MRD Compensated is a compact 9mm semi-auto pistol with a 4.2″ compensated barrel. It has a polymer frame, a matte slide finish and a 12-round capacity.
What sets it apart
The compensated barrel is the main feature. A compensator vents gas to help manage muzzle rise, which can make follow-up shots easier to line up. The pistol is also optics ready, so a red dot sight can be added to the slide. Check your optic’s mounting requirements before you order.
This pistol suits shooters who want a compact 9mm without giving up barrel length. The compact frame makes it a reasonable choice for concealed carry. The 9mm chambering also keeps range ammo easy to find, which helps for practice and training.
Gear matters with a compensated, optics-ready pistol. Look for a holster made to fit a compensated barrel, and one that allows for a mounted red dot if you plan to add one. Spare magazines, a good supply of 9mm ammo, a cleaning kit and a lockable case round out a solid setup.
Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
Frequently Asked Questions
Q: What caliber is the FN America 509 Compact MRD Compensated?
A: 9mm. It is a semi-auto pistol chambered in 9mm.
Q: How many rounds does the FN 509 Compact MRD Compensated hold?
A: 12 rounds. That is the listed capacity for this model.
Q: Is the FN 509 Compact MRD Compensated optics ready?
A: Yes. The sights are listed as optics ready, so a red dot can be added. Check the mounting requirements of your optic before you order.
Q: What is the barrel length on this FN 509 Compact?
A: 4.2 inches. The barrel is compensated.
Q: Is the FN 509 Compact MRD Compensated a polymer-frame pistol?
A: Yes. The frame is polymer and the size is compact. The slide has a matte finish.
Warranty and Manufacturer
Covered by the FN America factory warranty. Full product details and warranty terms are on the FN America website.
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