FN 509 Compact MRD 9mm 3.7in Optic-Ready Pistol

The FN 509 Compact MRD is an optics-ready compact pistol chambered in 9mm with a 3.7-inch barrel. It combines a cold hammer-forged stainless steel barrel and a polymer frame with a MIL-STD-1913 accessory rail. The pistol ships with one 12-round and one 15-round magazine and features fully ambidextrous controls and an FN Low-Profile Optics Mount.

Key Specifications

• The pistol is chambered in 9mm.
• The barrel measures 3.7 inches.
• The action is listed as Double Action Only in the supplied data.
• The slide is Optic Ready/Serrated.
• The barrel is cold hammer-forged stainless steel with a recessed target crown.
• The frame is a polymer frame with Picatinny rail.
• Includes one 12-round and one 15-round magazine.
• Features the FN Low Profile Optics Mounting System for many miniature red-dot optics with co-witnessing iron sights.
• Compatible with FN 509 17- and 24-round magazines with appropriate magazine sleeves.
• The controls are fully ambidextrous.

Designed for reliable, everyday carry and duty use, the FN 509 Compact MRD pairs a compact footprint with an optics-capable slide and user-focused controls. Its modular grip options and included magazines make it adaptable to a range of carry preferences, while the cold hammer-forged barrel and steel slide deliver durability and consistent performance. This configuration provides a practical balance of concealability, accessory readiness, and proven FN engineering for shooters seeking a compact optic-ready pistol.