FN 502 MRD 22 LR 4 in Barrel 10rd Black Optic-Ready Pistol

Description

The FN 502 MRD 22 LR 4 in Barrel 10rd Black Optic-Ready Pistol is a rimfire semi-auto that mirrors the full-size FN 509 in grip angle, slide profile, and control layout, letting you train with .22 LR economy without losing the feel of your duty gun. It ships with two 10-round magazines, a target-crowned steel barrel, and an optics-ready slide that accepts most common reflex sights right out of the box.

Manufacturer	FN America
Model	FN 502 MRD
Material	Steel barrel, polymer frame (per manufacturer specs)
Compatibility	Accepts most micro red-dot optics (Shield RMS, Docter, Trijicon RMR pattern with adapter)
Finish	Black, matte
Weight	Approx. 22.0 oz (unloaded, per manufacturer specs)
Condition	New

Key Features

• Optics-Ready Slide — Comes pre-milled with a multi-pattern footprint, so you can mount a red dot without sending the slide off to a machinist. That means faster target acquisition and a flatter sight picture at the range.
• Target-Crowned Steel Barrel — The 4-inch barrel has a target crown at the muzzle to protect the rifling and improve accuracy. Makes that 25-yard bullseye group a little tighter.
• Ambidextrous Controls & Manual Safety — Slide stop, magazine release, and safety lever all work for lefties and righties alike. A manual safety gives you an extra layer of confidence when holstering or storing the pistol.
• Two 10-Round Magazines — You get two magazines in the box, so you can load up both before hitting the line. No waiting, more shooting.
• Familiar FN 509 Ergonomics — Same grip angle, same trigger reach, same slide serrations. Train with the 502, shoot the 509 better. It’s that simple.

Who It’s For

This pistol is built for the shooter who carries or competes with a full-size FN 509 and wants a rimfire trainer that feels identical in the hand. It’s also a fine choice for the dove hunter who likes to burn through a few bricks of .22 LR during the off-season, or for anyone teaching a new shooter on a familiar platform.

Pros & Cons

• Pro: Optics-ready out of the box — no extra machining cost.
• Pro: Full-size grip fits medium-to-large hands comfortably.
• Pro: Reliable with high-velocity .22 LR ammo, which is easy to find.
• Con: The manual safety can be a bit stiff when new; it loosens up after a few hundred rounds.

Comparison

Feature	FN 502 MRD	Zev Technologies OZ9	Geissele Automatics Super Pistol
Caliber	.22 LR	9mm	9mm
Barrel Length	4 in	4.5 in	4.5 in
Optic-Ready	Yes (multi-footprint)	Yes (RMR pattern)	Yes (RMR pattern)
Weight (unloaded)	22.0 oz	24.5 oz	23.0 oz
Magazine Capacity	10 rounds	17 rounds	17 rounds
Price Range	$393.76	$1,200+	$800+
Best For	Training / plinking	Competition / duty	Competition / duty

FAQ

What red dots fit the FN 502 MRD slide?

The slide is cut for the Shield RMS/Docter footprint, but it also includes adapter plates for Trijicon RMR and other common patterns. Check the manual for the specific plate you need.

Will the FN 502 cycle standard-velocity .22 LR ammo?

It runs best with high-velocity ammunition (1200+ fps). Standard velocity may cause occasional failure to eject, especially during the first 200 rounds.

Does the FN 502 come with a threaded barrel?

No, this model has a standard target-crowned barrel. FN does offer a threaded-barrel version (the FN 502 Tactical) if you want to attach a suppressor.

Can I use FN 509 holsters with the FN 502?

In most cases, yes. The 502 shares the same external dimensions as the 509, so many holsters designed for the 509 will fit. Always test retention before carrying.

Is the manual safety removable?

Yes, the safety can be removed by a qualified gunsmith, but doing so voids the factory warranty. Most shooters leave it on for training consistency.

Final Word

The FN 502 MRD gives you a rimfire trainer that feels and handles like your centerfire pistol, with an optics-ready slide and two magazines in the box. At under $400, it’s a smart buy for anyone serious about practice without the ammo cost. Shop all semi-auto handguns or browse our rimfire pistols and FN handguns.

• ✅ Nationwide delivery (all 50 states)
• ✅ Ships 1-2 business days
• ✅ 30-day returns
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Last updated: April 2026