Modern duty pistols need to balance ergonomics, sighting systems, and reliability for everyday carry or duty use. The FN 509 MRD is a compact platform built around those priorities, offering a factory-cut optic-ready slide and features that translate to immediate, practical performance on the range and in the field.

FN 509 MRD pairs a 4″ barrel 9x19mm striker-fired action with a Holosun HS407C X2 red dot optic mounted at the factory cut, creating a modern, rapid-target-acquisition package ready for service or personal defense. Shop this product

Key features and why they matter

This pre-owned FN 509 MRD ships in Very Good condition and includes a Holosun HS407C X2 — a compact red dot with adjustable brightness and a solar panel for supplemental power. The optic co-witnesses with the iron sights, allowing for immediate fallback if the dot is obscured. The 17+1 capacity and 4″ barrel length strike a balance between concealability and ballistic performance for 9x19mm, a widely supported defensive caliber known for controllability and ammunition availability.

Controls, ergonomics, and modularity

The FN 509 MRD features fully ambidextrous controls and interchangeable back straps, enabling shooters to tailor the grip to their hand size and support either-hand use. An accessory rail accepts lights or lasers for low-light work. These elements make the pistol adaptable for left- or right-handed shooters, duty rigs, or everyday carry platforms.

Optic specifics and sight picture

The Holosun HS407C X2 offers adjustable brightness settings and a solar panel to extend battery life. Co-witnessing with factory sights gives redundancy: acquire the dot for rapid shots, or use irons for precision or when optics are unavailable.

Condition, checks, and pricing

This listing notes the firearm is pre-owned and function checked on receipt; the seller does not test fire used guns. Price is listed at $949.99, reflecting the included optic and factory MRD configuration. For exact current stock and to complete a purchase, View product details and pricing.

For a compact 9mm with a factory-mounted red dot, ambidextrous controls, and duty-capable capacity, the FN 509 MRD is an articulate option. Click to Check current availability and confirm local transfer requirements before purchase.

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