FN 502 MRD | .22 LR | 4″ Barrel | 10rd | 66101013

The FN 502 MRD is an optics-ready .22 LR pistol built with FN-style ergonomics and a target-grade fire control. It pairs a 4-inch target-crown steel barrel with a textured polymer frame and ambidextrous controls aimed at repeatable, low-cost range shooting. For a red-dot that complements the MRD without exceeding $1,000, the Holosun 507C is a practical option that fits common optic footprints. Intended uses include high-volume range training and precision rimfire target practice.

Product Specifications

• The UPC is 845737013325.
• The caliber is .22 LR.
• The barrel length is 4 inches with a target-crowned muzzle.
• The action is Semi-Auto (Single Action Only fire control as described in manufacturer notes).
• The frame material is polymer with an integrated accessory rail.
• The slide is described as optic-ready and serrated.
• The magazine capacity is 10 rounds, and the pistol includes two magazines.
• The weight is listed as 22.5 oz.
• The sights are fixed, suppressor-height optic-height style.
• The finish is black PVD / anodized on slide and frame color.
• The pistol ships with two 10-round magazines.
• The rate of twist is 1:16 RH.
• The product is identified as ATF Model 502 and ATF Type PISTOL.

The 502 MRD balances an FN-style grip and controls with a rimfire platform designed for economical practice and accurate group work. Its optic-ready slide and standard optic footprints make mounting a micro red dot straightforward, while ambidextrous controls and a clean trigger break support consistent follow-up shots. If you want a handgun that feels familiar to FN 509 users but runs on affordable .22 LR ammunition, the 502 MRD provides a solid, practical option for range training and rimfire target shooting.

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