# FN 509M Mid Size 9mm 4in Black Night Sights

**Brand:** FN Herstal
**Category:** Mid-Size Handguns
**Caliber:** 9mm

## Specifications

- **Caliber:** 9mm
- **Barrel Length:** 4"
- **UPC:** 845737013783
- **SKU:** UCEt9uJt9

## Description

The FN 509M Mid Size is a semi-automatic pistol chambered in 9mm with a 4-inch barrel. It has polymer grips, night sights, and a blue/black finish. The 509M ships with 15-round magazines.

### Key Specifications
- **Brand**: FN
- **Model**: 509M
- **Caliber**: 9mm
- **Action**: Semi Auto
- **Capacity**: 15+1
- **Barrel Length**: 4 in
- **Color/Finish**: Blue/Black

### Detailed Features
- 4-inch barrel
- Polymer grips
- Night sights
- 15-round magazine capacity
- Blue/Black finish

## Frequently Asked Questions

**Q: What caliber is the FN 509M?**

A: The 509M is chambered in 9mm.

**Q: Who makes the FN 509M?**

A: The 509M is made by FN Herstal.

**Q: What type of firearm is the FN 509M?**

A: It is a semi-automatic pistol in the mid-size handgun category.

**Q: What is the barrel length of the FN 509M?**

A: The 509M has a 4-inch barrel.

**Q: How many rounds does the FN 509M hold?**

A: It ships with 15-round magazines, giving a capacity of 15+1 rounds.

**Q: Does the FN 509M have night sights?**

A: Yes, the 509M comes with night sights.

**Q: Where can I buy the FN 509M?**

A: Compare current vendor offers on this page.

## What Customers Say

*AI-generated insights from customer reviews*

Owners of the FN 509M frequently mention the night sights as a standout feature for a factory-configured pistol. The mid-size frame works well for a range of hand sizes, and most owners report a natural point of aim straight out of the box.

The 509M trigger gets split reviews. Some owners find the reset crisp and consistent, while others prefer a shorter take-up and will upgrade it early on. The polymer grip texture is generally liked, though a few owners add grip tape for a more aggressive purchase in wet conditions.

The FN 509M occupies a competitive price tier for a polymer-frame service pistol. Most owners feel the night sights and build quality justify the price over bare-bones alternatives. The blue/black finish on the slide is a minor talking point, mostly appreciated for aesthetics rather than any practical difference.

## Pricing

**1 offers available**

| Vendor | Price |
|--------|-------|
| Guns Com | $619.99 |

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