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New for 2026, the FN 309 MRD is FN's answer to folks who want the FN name and reliability without stepping up to the duty-grade 509 price point. It's a compact, polymer-framed 9mm built around an internal hammer-fired single-action system borrowed from the well-liked Reflex micro-9 lineup, and it comes optics-ready out of the box. Think of it as FN packing a lot of practical, real-world features into a gun that's easy to shoot, easy to load, and easy to live with.
The 309 runs a 3.8-inch alloy steel barrel with a recessed target crown to keep the muzzle rifling protected through hard use. Overall length sits at 7.4 inches, height is 5.4 inches with the flush 16-round magazine, width is a slim 1.26 inches, and it tips the scale at 22.5 ounces unloaded. That puts it right in compact carry territory, close to a Glock 19 in width but a touch shorter, so it conceals well while still giving you a full firing grip.
Two things stand out the moment you handle one. The slide racks with about 25% less resistance than the FN 509 Tactical, which is a genuine help for newer shooters, anyone with limited hand strength, or folks running gloves. The magazines follow the same theme, loading with roughly 40% less spring force than comparable pistols and using directional indicators to cut down on fumbling. The internal hammer-fired action delivers a clean trigger that breaks around 5 pounds with a short, consistent reset that tends to feel nicer than a lot of striker guns in this class.
Every 309 wears FN's MRD slide, cut for a direct-mount Leupold DeltaPoint Pro and Shield RMSc footprint, with adapter plates available for other optics. Underneath the dot, you get drift-adjustable polymer sights with a green fiber-optic front and a rounded U-notch rear. The dovetails match the FN 509, so the existing aftermarket sight options fit without modification. Add the accessory rail up front for a weapon light, a reversible magazine release, and multiple internal safeties with a no-trigger-pull takedown, and you've got a thoughtfully built carry gun.
Yes, every 309 MRD ships with an optics-ready slide cut for the Leupold DeltaPoint Pro and Shield RMSc footprint. You can mount many compatible dots directly, and adapter plates are available for other footprints like the Docter pattern. The slide also wears drift-adjustable iron sights with a green fiber-optic front so you're covered even without an optic.
FN tuned the recoil system so the slide racks with about 25% less resistance than the FN 509 Tactical. It's a real engineering change rather than a gimmick, and it makes a noticeable difference for new shooters, anyone with reduced hand strength, or folks wearing gloves. The magazines are easier on the thumbs too, loading with roughly 40% less spring force.
This model ships with two magazines: one flush-fit 16-round and one extended 20-round. Both are polymer-bodied with directional indicators to make loading and seating easier. The 16-rounder gives you a more concealable footprint while the 20-rounder maxes out capacity.
The 309 MRD uses an internal hammer-fired, single-action-only system inspired by FN's Reflex series, which is unusual in this class. It produces a clean trigger that breaks around 5 pounds with a short, consistent reset that many shooters prefer over typical striker setups. The action also allows takedown without pulling the trigger.
Yes, the 309 shares the same dovetail specifications as the FN 509. That means the large existing aftermarket of 509-pattern sights drops in without any modification. It's a nice perk if you want to swap in night sights or a different front sight down the road.
It lands in the compact category, measuring 7.4 inches long, 5.4 inches tall with the flush magazine, and 1.26 inches wide at 22.5 ounces unloaded. That puts it close to a Glock 19 in width, making it a solid everyday carry option that still gives you a full grip. A quality IWB holster handles it easily.
| UPC | 845737020620 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-102378 |
| Action | |
| Barrel Length | 3.8" |
| Caliber/Gauge | 9mm |
| Capacity | 20 + 1 |
| Safety | Manual |
| Shipping Weight | 2.4 |
| Slide Description | Optic Ready/Serrated |
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