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There aren't many .22 LR pistols that feel like a serious duty gun in your hands, but the FN 502 MRD is one of them. FN built this rimfire around the same ergonomic DNA as the FN 509, so the grip texture, balance, and control layout all carry over. The result is a pistol that trains exactly like the real thing but runs on cheap ammo. The slide is aircraft-grade anodized aluminum and steel, not the flimsy zinc-alloy construction you see on budget rimfires, and the 4-inch barrel features a recessed target crown for consistent accuracy. A loaded chamber indicator and front and rear cocking serrations round out the practical details.
The MRD name stands for Miniature Red Dot, and this pistol takes that seriously. The slide uses FN's Low-Profile Optics Mounting System, the same platform concept that proved itself on the 509 family, and it ships with mounting plates to accommodate a wide range of popular micro red dot footprints. The included co-witness height iron sights stay in the picture even with a dot mounted, so you're not left with nothing if your optic goes down. It's a well-thought-out setup for anyone building a training-focused rimfire rig.
Unlike the striker-fired FN 509, the 502 MRD uses a single-action hammer-fired design with 1911-style ambidextrous thumb safeties on both sides of the frame. The trigger breaks cleanly and is one of the genuinely standout features of this pistol, especially for a rimfire at this price point. The magazine release is also fully ambidextrous, so lefties get the same intuitive experience without any modifications. Two flush-fit 10-round magazines come in the box, and the gun accepts the 15-round magazines from the 502 Tactical if you want more capacity down the line.
Because it shares its dimensions with the FN 509, the 502 MRD fits most FN 509 holsters, which is a real convenience if you're using this pistol to train for your 9mm carry setup. There's also a Picatinny rail on the dust cover for mounting a light or laser. At 22.5 oz. unloaded, it has enough weight to feel substantial without being fatiguing over a long range session.
The 502 MRD uses FN's Low-Profile Optics Mounting System and ships with multiple mounting plates to accommodate a wide range of popular micro red dot footprints. Most common MRD-footprint optics from major brands will have a compatible plate included or available. The included co-witness irons work alongside your dot so you retain a backup sighting option.
Yes, in most cases it will. FN designed the 502 MRD around the same overall dimensions as the 509, so it fits the majority of holsters made for that platform. It's one of the more practical features of this pistol for anyone using it as a training companion to their 509.
Like most .22 LR semi-autos, the 502 MRD tends to run best once it's had some rounds through it and has been properly cleaned and lubricated. Running quality high-velocity ammo like CCI Mini-Mag during the initial break-in helps things run smoothly right away. After the first few hundred rounds with regular cleaning, reliability generally becomes very consistent.
The main differences are the barrel and magazine capacity. The Tactical has a 4.6-inch threaded barrel for suppressor use and ships with a 15-round magazine, while the MRD has a standard 4-inch target-crowned barrel and comes with two 10-round magazines. Both share the same core ergonomics, trigger system, and optics-ready slide platform. The 502 MRD will accept the Tactical's 15-round magazines if you want the higher capacity option.
It's genuinely one of the better choices out there for that purpose. The 502 MRD was specifically designed to mirror the ergonomics and controls of the FN 509, so the muscle memory you build here carries over directly. Running the same grip texture, trigger feel, and control layout on cheap .22 LR ammo lets you put in a much higher volume of reps without the cost or fatigue of centerfire training.
Yes, the 502 MRD is hammer-fired with a single-action-only trigger, which sets it apart from the striker-fired FN 509 it's modeled after. It also features 1911-style ambidextrous thumb safeties on both sides of the frame. The hammer and SAO design contribute to the clean, crisp trigger feel that reviewers consistently highlight as one of the pistol's best qualities.
| UPC | 845737013325 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-101013 |
| Action | |
| Barrel Finish | Black |
| Barrel Length | 4" |
| Caliber/Gauge | .22 LR |
| Capacity | 10 + 1 |
| Color | Black |
| Model | |
| Number of Magazines | 2 |
| Product Type | Single Action |
| Safety | Manual |
| Sights | Optic Height Sights |
| Sights Type | FIXED |
| Slide Description | Optic Ready/Serrated |
| ATF Type | Pistol |
| Length | 11.6000 |
| Package Height | 2.8 |
| Package Width | 8.7 |
| Shipping Weight | 3.05 |
| State Restriction (CA) | NO SALE TO CALIFORNIA |
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