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IA Iron River Armory

FN 509M MRD Midsize 9mm 15+1 4-inch Optic-Ready

SKUTSW|114985 Conditionnew CategorySemi Auto Handguns
$658.58
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About this product

The FN 509M MRD is a midsize, optic-ready 9mm pistol built for everyday carry and practical field use. It pairs a 4-inch cold hammer-forged stainless barrel with a midsize polymer frame and a MIL-STD-1913 accessory rail. The pistol ships with FN’s Low Profile Optics Mounting System and two magazines, giving a ready-to-configure platform for modern carry and duty applications.

Key Specifications

  • Caliber: 9mm.
  • Capacity: 15+1 standard configuration.
  • Barrel Length: 4 inches with a recessed crown.
  • Barrel Description: Cold hammer-forged stainless steel.
  • Frame Material: Polymer with Picatinny rail.
  • Weight: 26.5 oz.
  • Overall Length: 7.4 inches.
  • Sights: Black co-witness iron sights.
  • Includes: Two magazines and FN Optics Mounting System.
  • Rate of Twist: 1:10 RH.

Thoughtfully configured for users who prioritize reliable everyday carry performance, the FN 509M MRD combines a hardened, cold hammer-forged barrel and optics-ready slide with an ergonomic midsize frame. Interchangeable backstraps, improved grip texturing and aggressive slide serrations make manipulation straightforward in daily-use scenarios, while the included optic mounting system and magazines provide immediate flexibility for setup. The 509M MRD is a balanced option for shooters seeking a compact platform that supports modern sighting solutions without sacrificing capacity or utility.

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Specs at a glance

FN 509M MRD Midsize 9mm 15+… SPECS AT A GLANCE 26.5 oz WEIGHT 9mm SIZE
Editorial diagram — measurements verified during testing.
Sources & methodology. Editorial review and rating by Travis Caldwell based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication.
$658.58