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FN took everything that made the 509 a favorite duty pistol and shrunk it down into a rimfire you can shoot all day without breaking the bank. The 502 MRD carries the distinction of being the industry's first slide-mounted, optics-ready .22 LR handgun, which means you get a factory-milled slide ready for a micro red dot right out of the box. It runs a hammer-fired single-action system, a 4-inch barrel, and a 10+1 capacity, with two 10-round magazines included so you spend more time shooting and less time loading.
The big draw here is the optic setup. FN's Low-Profile Optics Mounting System ships with a set of adapter plates covering common micro red dot footprints, so whether you're running a Trijicon RMR pattern, a Shield RMS, or similar, there's a plate to match. The factory suppressor-height iron sights co-witness through the dot, and the front sight is dovetailed for easy swaps. A heavier solid cover plate is included too, so the slide cycles correctly whether you're running irons or an optic.
Where this gun shines is training. The grip texture, balance, and bilateral controls (manual safety, slide stop, and mag release) match the 509 closely enough that practice carries over to your defensive pistol, just at rimfire prices. The trigger breaks right around 5 pounds, and plenty of owners find it crisper in person than the spec sheet suggests. It eats a wide spread of .22 LR, though like most blowback rimfires it prefers standard to high-velocity loads over quiet subsonic stuff that won't reliably cycle the slide.
This is the MRD variant, so it has a standard 4-inch barrel rather than the threaded muzzle found on the 502 Tactical. If suppressor use isn't on your list, the MRD gives you the same optics-ready platform for less. It also fits most FN 509 holsters, which makes kitting it out simple. Built by Umarex to FN's specs, it's earned a solid reputation as one of the more capable rimfire trainers on the market.
Yes. The 502 MRD uses FN's Low-Profile Optics Mounting System and ships with adapter plates that cover common micro red dot footprints like the Trijicon RMR and Shield RMS patterns. You'll need to match your specific optic to the correct plate, and the mounting screws come with each plate. The factory irons co-witness through most dots.
The main difference is the barrel. The Tactical has a longer threaded barrel for running a suppressor and a 15-round magazine option, while this MRD has a standard 4-inch barrel and ships with two 10-round mags. Both share the same optics-ready slide and 509-inspired ergonomics, so the MRD is the pick if suppressor use isn't a priority.
It handles a wide range of .22 LR, and most owners report it cycles standard and high-velocity loads reliably. Like most blowback rimfire pistols, it can struggle with very low-power subsonic or quiet ammunition that doesn't generate enough energy to cycle the slide. Sticking with standard-velocity or hotter loads keeps things running smoothly.
Yes, most holsters built for the FN 509 will fit the 502 thanks to their shared dimensions and grip design. That overlap is intentional since FN built the 502 as a rimfire trainer for 509 owners. It makes finding holster options easy.
It's one of the better rimfire trainers out there for exactly that reason. The grip texture, balance, and ambidextrous controls closely mirror the centerfire FN 509, so high-volume practice carries over while burning inexpensive .22 LR instead of pricier centerfire ammo. The optics-ready slide also lets you train with a red dot just like your defensive gun.
The 502 is built by Umarex in Germany to FN's specifications, with the slide, frame, and fire control group marked accordingly. Umarex produces licensed rimfire versions of popular pistols for several major brands. It carries FN's design and quality standards as one of the more capable rimfire pistols available.
| UPC | 845737013318 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-101012 |
| Action | |
| Barrel Finish | Black |
| Barrel Length | 4" |
| Caliber/Gauge | .22 LR |
| Capacity | 10 + 1 |
| Color | Flat Dark Earth |
| Number of Magazines | 2 |
| Product Type | Single Action |
| Safety | Manual |
| Sights | Suppressor Height Sights |
| Sights Type | FIXED |
| Slide Description | Optic Ready/Serrated |
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