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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 Connecticut?
Yes. It ships to a licensed FFL dealer in Connecticut; you pick it up there after the background check. Connecticut buyers need a pistol permit or Handgun Eligibility Certificate, and the Connecticut dealer will only transfer this model if it and its magazines (10 rounds or fewer) are legal in Connecticut.
Is it in stock?
Yes, at $763.59. Orders leave within 1-2 business days; shipping is free over $999.

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