# FN 509 MRD Striker-Fired 9mm Pistol with Holosun 407C Sight

**Brand:** FN Herstal
**Category:** Full Size Handguns
**Caliber:** 9mm

## Specifications

- **Caliber:** 9mm
- **Barrel Length:** 4"
- **Capacity:** 10 rounds
- **Finish:** Black
- **Weight:** 26.9 oz
- **Overall Length:** 7.4"
- **UPC:** 845737018351
- **SKU:** UCEt9uL4p

## Description

The FN 509 MRD is a striker-fired 9mm pistol with a 4" hammer-forged stainless barrel and the Holosun 407C mounted from the factory. Black polymer frame, 26.9 oz., and a 10+1 capacity with two magazines included. It's built around the same optics-ready platform as the rest of the 509 line, which means the red dot mounts directly without an adapter.

### Key Specifications:
- **Manufacturer:** FN
- **Family:** 509 Series
- **Model:** FN 509 MRD
- **Type:** Semi-Auto Pistol
- **Action:** Striker Fired
- **Caliber/Gauge:** 9mm
- **Finish:** Black
- **Frame Material:** Polymer Frame
- **Barrel Length:** 4"
- **Overall Length:** 7.4"
- **Capacity:** 10 + 1 (2 magazines included)
- **Sights:** Holosun 407C (Fixed Sights)
- **Weight:** 26.9 oz

### Detailed Features:
The hammer-forged stainless barrel holds up to hard use and contributes to shot-to-shot consistency. Striker-fired action means a predictable trigger pull every time, no pre-cocking required, and the reset is short enough to keep pace in faster shooting drills. The Holosun 407C gives you a bright 6 MOA dot that's easy to pick up quickly, and the fixed backup sights co-witness when needed. The polymer frame keeps weight reasonable while the overall 7.4" length stays manageable for holster carry.

## What Customers Say

*AI-generated insights from customer reviews*

Community discussion on the FN 509 MRD with Holosun 407C tends to land on the positive side, though there are genuine criticisms worth knowing about.

Ergonomics and grip get consistent praise. The pistol sits comfortably in hand, the controls fall naturally under thumb and fingers, and new shooters and experienced ones alike describe it as intuitive to operate. Reliability is another strong point. Malfunctions are rarely mentioned, and shooters report clean cycling across a variety of loads.

The Holosun 407C pairing draws positive feedback specifically because the red dot is already dialed in from the factory. Target acquisition is noticeably faster than iron sights for most people once they've trained with the optic, and the setup is sturdy enough that zero holds over time.

On the critical side: at 26.9 oz. unloaded some users find it a touch heavy for all-day carry compared to lighter compact options. Trigger feel is the other recurring note, most find it acceptable, but a segment of users wants a lighter pull or crisper break and will swap the trigger eventually. Price comes up occasionally as a comparison point against competitors, though most conclude FN's build quality justifies the cost. A few users mention initial difficulty seating or aligning the Holosun during first-time setup, though it seems to settle in cleanly once sorted.

## Pricing

**1 offers available**

| Vendor | Price |
|--------|-------|
| Selwayarmory Com | $849.00 |

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*Data from [GunsNation](https://gunsnation.com)*