# FN 509M Compact 9mm DAO Pistol, 17+1 RD, Matte Black

**Brand:** FN Herstal
**Category:** Compact Handguns
**Caliber:** 9mm

## Specifications

- **Caliber:** 9mm
- **Barrel Length:** 4"
- **Capacity:** 17 rounds
- **Finish:** Matte Black
- **Weight:** 26.4 oz
- **Overall Length:** 7.4"
- **UPC:** 845737018368
- **SKU:** UCEt9uL56

## Description

The FN 509M is a full-size 9mm DAO pistol chambered in 9MM Luger with a 4" barrel and 17+1 capacity. Its double-action-only trigger eliminates the need for external safeties, and the flat-face trigger face gives a consistent feel across different finger positions.

### Key Specifications
- **SKU**: 2024020061
- **UPC**: 845737018368
- **Brand**: FN
- **Model Name**: 509M
- **MPN**: 66101930
- **Caliber**: 9MM LUGER
- **Action**: DAO (Double Action Only)
- **Capacity**: 17+1 RD 
- **Barrel Length**: 4"
- **Overall Length**: 7.40"
- **Weight**: 1.65 lbs 
- **Sights**: Co-Witness Iron 
- **Grip Type**: Black Interchangeable Backstrap 
- **Trigger Type**: Flat Face 
- **Safety Features**: None (DAO configuration)
- **Finish**: Matte Black 
- **Condition**: New in Box 

### Detailed Features
The DAO action keeps the trigger pull weight consistent from the first shot to the last, which some shooters find more predictable under stress than a DA/SA transition. There are no external safeties to disengage.

Interchangeable backstraps let users adjust grip size to their hand. Co-witness iron sights align with most red-dot mounting heights. At 1.65 lbs, the pistol is on the lighter end for a full-size 17+1 platform.

### Target Audience
The DAO configuration suits users who want a simple, consistent trigger for defensive or duty use. Competitive shooters who prefer striker-fired platforms may find the longer DA pull less ideal for speed work.

### Usage Scenarios
- **Home Defense**: High capacity and DAO simplicity work well for a ready firearm.
- **Sport Shooting**: Works for practice and casual competition; heavier trigger pull is a trade-off.
- **Everyday Carry**: At 1.65 lbs unloaded, it is manageable for all-day carry with the right holster.

## Frequently Asked Questions

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

A: The FN 509M is chambered in 9mm Luger.

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

A: It has a 4-inch barrel.

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

A: It has a 17+1 capacity.

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

A: FN Herstal makes the 509M.

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

A: It is a full-size DAO (double-action-only) semi-automatic pistol. The DAO trigger delivers a consistent pull weight on every shot with no external safeties.

**Q: What sights does the FN 509M have?**

A: It has co-witness iron sights, which align with most red-dot mounting heights.

**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*

Feedback on the FN 509M Compact 9mm DAO Pistol tends to be positive on build quality and reliability, with some reservations around the trigger system.

**Positive Aspects:**

1. Ergonomics and Comfort: Most owners find the grip comfortable and the pistol easy to handle during range sessions.

2. Reliability: Commonly cited as a strength, owners report consistent function across various ammunition types.

3. Capacity: The 17+1 round count is frequently mentioned as a practical advantage over smaller-capacity options.

4. Build Quality: The construction earns praise for feeling solid and holding up to sustained use.

5. Sights and Accuracy: Factory sights are generally rated well for out-of-the-box accuracy.

**Constructive Criticism:**

1. Weight: Some users find it heavier than comparable compact options, which affects carry comfort.

2. DAO Trigger System: This is the most common point of debate. Owners who prefer shorter, lighter striker-fired pulls find the DAO less comfortable for fast shooting.

3. Price Point: A few buyers feel the price is high relative to alternatives with similar specs.

4. Accessory Compatibility: Some users want more aftermarket holster and sight options specifically tailored to this model.

## Pricing

**1 offers available**

| Vendor | Price |
|--------|-------|
| Guns Com | $759.99 |

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