FN 66100587 509M MRD Mid-Size 9mm Luger 15+1 4″ Black Recessed Crown Barrel, Matte Black Optic Ready/Serrated Stainless Steel Slide, Matte Black Polymer Frame w/Picatinny Rail, Ambidextrous

Posted on June 3, 2026 by Lisa Roberts

$711.75

FN 66100587 509M MRD Mid-Size 9mm Luger 15+1 4″ Black Recessed Crown Barrel, Matte Black Optic Ready/Serrated Stainless Steel Slide, Matte Black Polymer Frame w/Picatinny Rail, Ambidextrous

94 in stock

SKU: TSW|114985 Category:

Description

The FN 509 Midsize MRD featuring the FN Low Profile Optics Mounting System, gives you the option of direct mounting more than 10 different miniature red dot optics to your concealed carry pistol. The combination of a 4″ slide and barrel with a midsize frame retains full-sized pistol performance in an easily-concealed package. The improved controls aid in manipulation, while the improved texturing on the two included backstraps provides better recoil management. Features a flat faced trigger; fully ambidextrous controls; MIL-STD-1913 accessory mounting rail; cold hammer-forged stainless steel barrel with a recessed target crown; combat-style sights and improved front and rear cocking serrations. Includes two magazines, case, locking device and owners manual.

Additional information

UPC

845737010737

Manufacturer

FN America / FN Herstal

Manufacturer Part Number

66-100587

Action

Semi-Auto

ATF Type

Pistol

Barrel Length

4"

Caliber/Gauge

9mm

Capacity

15

Color

Black

Length

11.5

Number of Magazines

2

Package Height

2.5

Package Width

8.2

Product Type

Semi-Auto Pistol

Rate of Twist

1:10"

Safety

No

Shipping Weight

3.15

Sights

Black Co-Witness Iron Sights

Sights Type

Combat

Slide Description

Black Steel

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