FN 509 MRD 9MM Luger - Flat Dark Earth, 4.5" Barrel, 10-Round

Name: FN 509 MRD 9MM Luger - Flat Dark Earth, 4.5" Barrel, 10-Round
Brand: FN Herstal
SKU: UCEt9uJNo
Availability: InStock

The FN 509 MRD 9MM Luger - Flat Dark Earth, 4.5" Barrel, 10-Round is a 9mm full size handguns from FN Herstal. It is available from 2 vendors at $694.49 to $696.99.

FN 509 MRD 9MM Luger - Flat Dark Earth, 4.5" Barrel, 10-Round - view 2

FN 509 MRD 9MM Luger - Flat Dark Earth, 4.5" Barrel, 10-Round - view 3

FN 509 MRD 9MM Luger - Flat Dark Earth, 4.5" Barrel, 10-Round - view 4

From $694.49

Product Information

Name: FN 509 MRD 9MM Luger - Flat Dark Earth, 4.5" Barrel, 10-Round

Brand: FN Herstal

Category: Full Size Handguns

Caliber: 9mm

Barrel Length: 4.5"

Capacity: 10 rounds

UPC: 845737011840

SKU: UCEt9uJNo

Description

The FN 509 MRD is a striker-fired 9mm pistol with a 4.5-inch barrel and Flat Dark Earth finish. It ships with a 10-round magazine and is set up for micro red dot mounting.

Key Specifications

UPC: 845737011840
Action: Double Action (striker-fired)
Barrel Length: 4.5 inches
Caliber: 9MM Luger 9x19 Para
Capacity: 10 rounds
Finish: Flat Dark Earth
Weight: 1.75 lbs.

Detailed Features

The 4.5-inch barrel gives the 509 MRD a full-size feel and is long enough to extract good velocity from 9mm. The MRD designation refers to the factory-milled slide, which accepts micro red dots without a separate adapter plate. The double-action striker-fired trigger is consistent shot to shot. At 1.75 lbs empty, it's on the lighter end for a full-size 9mm.

The Flat Dark Earth finish covers the polymer frame; the slide is typically black.

Usage Scenarios

Home defense: 10-round capacity, optics-ready slide, and 4.5-inch barrel suit a defensive build well
Sport shooting: optics compatibility and consistent trigger support competition use
Duty or range use: the 509 platform is used by law enforcement and holds up to heavy round counts

Complete Specifications

Caliber	9mm
Model	FN 509 MRD
Capacity	10 rounds
Magazines included	2
Barrel length	4.5"
Overall length	7.9"
Weight	28 oz
Action	Double Action
Finish	FLAT DARK EARTH
Sights	Fixed Sights
Safety	No Manual

Frequently Asked Questions

What caliber is the FN 509 MRD?

The FN 509 MRD is chambered in 9mm Luger (9x19 Para).

What is the barrel length of the FN 509 MRD?

It has a 4.5-inch barrel.

How many rounds does the FN 509 MRD hold?

It has a 10-round capacity.

Who makes the FN 509 MRD?

It is made by FN Herstal.

What type of firearm is the FN 509 MRD?

It is a striker-fired, semi-automatic pistol in the full-size handgun category.

Is the FN 509 MRD optic-ready?

Yes. The MRD designation refers to a factory-milled slide that accepts micro red dots without a separate adapter plate.

Where can I buy the FN 509 MRD?

Compare current vendor offers on this page.

Customers Say

AI-generated insights derived from customer reviews and discussions on popular gun-enthusiast forums.

The FN 509 MRD in FDE gets positive feedback on build quality and the factory optics-ready slide, which simplifies setting up a red dot without modification costs. Ergonomics are well-regarded — the grip texture is considered effective without being aggressive, and the controls are intuitive.

Accuracy with the 4.5-inch barrel is consistently rated well across different distances. Reliability is generally reported as solid.

The 10-round capacity is the most common point of friction for buyers in unrestricted states where higher-capacity magazines are available; in those cases some owners find it limiting compared to competitors. Weight comes up as a minor discussion point — most find 1.75 lbs acceptable, but a few consider it heavier than preferred for daily carry.

Occasional reports of trigger or slide lock issues appear in reviews, though these read as outliers rather than a pattern. The FN 509 MRD holds its own in comparisons to other optics-ready 9mm pistols and is well-regarded for reliability and fit and finish.