The FN 509 MRD 9mm Luger Pistol (Model 66-102378) is a high-capacity, striker-fired handgun designed for professionals, competitive shooters, and serious enthusiasts who demand reliability and modern features. This optic-ready version of the FN 509 comes equipped with a 3.8-inch barrel, a fiber optic front sight, and a manual safety. It ships with both a 16-round and a 20-round magazine, giving shooters excellent capacity options right out of the box. The FN 509 MRD combines proven ergonomics, a crisp trigger, and a robust build quality that FN is known for worldwide.
Optic Ready Slide with Fiber Optic Front Sight
The FN 509 MRD features a factory optic-ready slide designed to accept a wide variety of micro red dot sights. This allows shooters to easily mount popular optics such as the Trijicon RMR, Holosun 507C, or Leupold DeltaPoint Pro for faster target acquisition and improved accuracy. Complementing the optic-ready slide is a high-visibility fiber optic front sight that provides a bright, clear sight picture in various lighting conditions, making the pistol highly effective for both range use and defensive applications.
The FN 509 MRD delivers modern performance with an optic-ready slide, fiber optic front sight, manual safety, and high-capacity magazines in a reliable 9mm platform.
High-Capacity Magazines Included
This model includes both a 16-round and a 20-round magazine. The 20-round magazine provides maximum firepower for competition or home defense, while the 16-round magazine offers a more compact option for concealed carry or when a lower profile is preferred. Both magazines are engineered for reliable feeding and smooth operation, even during rapid fire.
Manual Safety Configuration
The FN 509 MRD is equipped with a manual safety, offering an additional layer of security for users who prefer this feature. The ambidextrous manual safety allows for easy operation by both right- and left-handed shooters while maintaining the pistol’s fast-handling characteristics. This configuration is popular among law enforcement agencies and shooters who value the extra safety measure.
3.8-Inch Barrel and Ergonomic Design
The 3.8-inch barrel provides an excellent balance between concealability and ballistic performance. The FN 509 MRD features a polymer frame with aggressive texturing for a secure grip in all conditions. The pistol’s ergonomics are refined for comfort during extended range sessions while remaining compact enough for everyday carry. The striker-fired trigger delivers a smooth, consistent pull that enhances accuracy and control.
Key Features of the FN 509 MRD
- Optic Ready Slide – Compatible with most micro red dot sights
- Fiber Optic Front Sight – Bright and highly visible
- Manual Safety – Ambidextrous for added security
- 3.8" Barrel – Balanced size and performance
- High Capacity – Includes 16-round and 20-round magazines
- Striker-Fired Action – Smooth and consistent trigger
- Model 66-102378 – Official FN part number
- UPC 845737020620 – Authentic FN America product
Why Choose the FN 509 MRD?
The FN 509 MRD stands out as a premium, duty-ready 9mm pistol that combines modern features with the legendary reliability of FN. The optic-ready slide and fiber optic front sight make it an excellent choice for shooters who want to run a red dot sight while maintaining backup iron sights. The inclusion of both 16 and 20-round magazines provides flexibility for different carry and training needs. With its manual safety, refined ergonomics, and robust construction, the FN 509 MRD is well-suited for law enforcement, competitive shooting, and personal defense. FN’s reputation for building battle-proven firearms ensures this pistol will deliver consistent performance when it matters most.
Technical Specifications
| Brand | FN America |
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| Model | 509 MRD |
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| Part Number | 66-102378 |
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| Caliber | 9mm Luger |
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| Barrel Length | 3.8 Inches |
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| Magazine Capacity | 16-Round & 20-Round |
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| Sights | Fiber Optic Front / Optic Ready |
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| Safety | Ambidextrous Manual Safety |
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| Finish | Black |
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| Action | Striker-Fired |
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| UPC | 845737020620 |
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Ideal Applications
The FN 509 MRD is an outstanding choice for a wide range of applications. Law enforcement and security professionals will appreciate its reliability, high capacity, and optic-ready design. Competitive shooters in USPSA, IDPA, and 3-Gun will benefit from the fast sight acquisition and smooth trigger. Concealed carry permit holders who prefer a full-size pistol with high capacity will find the FN 509 MRD well-suited for everyday carry. The manual safety version is particularly popular with agencies and individuals who require an additional safety feature. Whether used for duty, competition, training, or personal protection, the FN 509 MRD delivers the performance and features expected from a premium modern 9mm pistol.
Experience premium performance with the FN 509 MRD 9mm Optic Ready Pistol. Featuring a 3.8-inch barrel, fiber optic front sight, manual safety, and both 16-round and 20-round magazines, this Model 66-102378 offers exceptional reliability and versatility. UPC 845737020620.
