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FN 509 MRD Midsize 9mm Black Pistol

The FN 509 Midsize MRD is a striker-fired 9mm pistol designed to balance service-ready performance with a more compact carry profile. Its 4-inch cold hammer forged stainless steel barrel supports durability and consistent accuracy, while the shortened grip improves concealability without reducing the standard 15+1 capacity. The FN Optics Mount System allows compatible red dot sights to be installed, and interchangeable backstraps help tailor the grip to the shooter's hand. Standard fixed sights provide a dependable aiming reference when no optic is mounted.

Key features

  • MRD optics-ready slide accepts compatible red dot sights through the FN Optics Mount System
  • 4-inch cold hammer forged stainless steel barrel provides durable, consistent performance
  • 15+1 capacity offers substantial on-board ammunition capacity
  • Shortened midsize grip supports improved concealability and handling
  • Interchangeable backstraps allow the grip fit to be customized
  • Integrated trigger safety and striker-fired operation support safe handling and fast deployment

The FN 509 Midsize MRD delivers optics-ready capability, practical capacity, and a carry-friendly profile in a dependable service-style pistol.

FN 509 MRD Midsize 9mm Black Pistol: quick facts

What caliber is the FN 509 MRD Midsize 9mm Black Pistol?
It is chambered in 9mm.
How many rounds does it hold?
15+1 rounds; magazines included: 2.
How big and heavy is it?
Barrel length 4 inches, overall length 7.4 inches, weight 26.9 ounces.
What kind of action does it use?
Semi-Automatic.
Is it optic ready or threaded?
Optic ready: Yes; threaded barrel: No.
What sights and finish does it have?
Sights: Standard Sights; finish: Black.
Is it new or used?
New, in the original packaging.
Can I buy it in Missouri?
Yes. It ships to a licensed FFL dealer in Missouri; you pick it up there after the background check. Missouri buyers pick this handgun up at a licensed dealer after a NICS check, with no permit to purchase and no waiting period; dealers require age 21 under federal law.
Is it in stock?
Yes, at $813.59. Orders leave within 1-2 business days; shipping is free over $999.

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