When your mission calls for a reliable, modern striker-fired pistol that balances concealability with duty-grade performance, you want a platform built on proven design and practical features. This review breaks down the FN 509 MIDSIZE MRD [BLK] *10-ROUND* from a tactical and user-focused perspective, covering how its features translate to real-world defensive and carry applications.
FN 509 MIDSIZE MRD [BLK] *10-ROUND* is built as a successor to FN’s respected FNS series and serves as FN’s modern striker-fired duty and defensive pistol. The Midsize variant’s 4-inch barrel and shortened grip make it easier to conceal while retaining a full-featured control set for duty or daily carry. Shop this product
Design and Ergonomics
As veterans know, ergonomics win fights. The FN 509 MIDSIZE MRD [BLK] *10-ROUND* pairs a polymer frame with a 4-inch steel barrel, giving a balance between recoil control and concealability. The polymer frame reduces weight and improves corrosion resistance compared to all-steel designs, which is ideal for everyday carry in varied environments.
Controls and Fit
Ambidextrous controls mean the pistol works for left- or right-handed shooters without modification to your training. Interchangeable backstraps allow users to tune grip circumference and hand placement, producing better trigger reach and faster, more consistent follow-up shots. The shortened grip profile on the Midsize model enhances concealability without significantly sacrificing control for shooters with medium to large hands.
Sights and Optics-Ready Slide
The MRD variant features an optic cut on the slide designed specifically for compatibility with FN’s adapter plates. Paired with suppressor-height iron sights, the setup is ready for a micro red dot and proper co-witnessing, which modern shooters and professionals increasingly prefer for faster target acquisition and improved accuracy under stress. Note that the optic is not included with the pistol; the slide is optimized for use with FN adapter plates to accept common MRD footprints.
3-Dot Luminescent Sights
Even without an optic, the 3-dot style luminescent sights provide positive sight pictures in low-light conditions and serve as a reliable backup should an MRD be removed or fail. The suppressor-height irons are especially useful when mounting taller optics or when threading suppressors are part of your mission set.
Controls, Safety, and Practical Use
This model is shipped without a manual safety, prioritizing speed of deployment and a consistent manual of arms favored by many duty and defensive carriers. For shooters who prefer minimal manual manipulation in critical moments, the lack of a manual thumb safety simplifies the draw-and-fire sequence while relying on internal safeties and trigger discipline.
Magazine Configuration and Capacity
The FN 509 MIDSIZE MRD [BLK] *10-ROUND* includes two 10-round magazines. That 10-round capacity is often chosen to meet local or state restrictions while still maintaining reasonable reload cadence and weight. Two magazines in the box make it easy to rotate magazines for training and carry, and the mags are built to FN’s duty-grade standards for durability and reliability.
Performance and Applications
Built as FN’s premier modern striker-fired duty and defensive pistol, this model bridges the gap between a full-size duty gun and a compact carry platform. The 4-inch barrel drives velocity and sight radius improvements over shorter-barrel compacts, aiding in accuracy during both rapid-fire and precision shots. The platform is suitable for law enforcement officers wanting a smaller duty sidearm, civilians seeking a capable concealed carry pistol, and instructors who need a durable, service-oriented design for training classes.
At a price of $725.99, the FN 509 MIDSIZE MRD [BLK] *10-ROUND* positions itself as a competitive option among optic-ready midsize pistols. For those focused on long-term value, the combination of ambidextrous controls, interchangeable backstraps, and an optic-ready slide represents a practical investment in adaptability.
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Maintenance and Reliability
FN’s evolution from the FNS series to the 509 platform reflects iterative improvements in reliability and user maintenance. The polymer frame and simplified internals mean fewer corrosion points and easier field-stripping for routine cleaning. The lack of a manual safety reduces mechanical complexity and points of failure, but shooters must practice safe handling and consistent trigger discipline.
Accessories and Modularity
The MRD slide opens options for optics and suppressor-height sights. Because the slide is set up to accept FN adapter plates, prospective owners should budget for an MRD and the appropriate adapter plate to realize the full potential of the optic-ready design. Standard accessory rails on the frame allow mounting of lights or lasers for low-light defensive scenarios.
For shooters and professionals who demand a service-grade striker-fired pistol that remains practical for carry, the FN 509 MIDSIZE MRD [BLK] *10-ROUND* offers a thoughtfully packaged balance of concealability, controls, and optic-ready capability. Its features are deliberate: ambidextrous controls for universal use, interchangeable backstraps for fit, suppressor-height irons for co-witnessing, and two 10-round magazines to meet common capacity needs while remaining ready for daily carry or duty rotation.
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People Also Ask
What makes this product stand out from competitors?
This product offers superior quality and innovative features that set it apart in the market. Its design focuses on both performance and reliability, making it a top choice for professionals and enthusiasts alike.
Is this product suitable for beginners?
Yes, this product is designed with user-friendly features that make it accessible to beginners while still offering advanced capabilities for experienced users.
What warranty or support is available?
The product comes with comprehensive warranty coverage and excellent customer support to ensure your satisfaction and peace of mind.
How does this compare to similar products in its price range?
This product offers exceptional value for its price point, providing features and quality that typically cost significantly more in comparable alternatives.
What maintenance is required?
Minimal maintenance is required thanks to the product’s durable construction and quality materials. Regular cleaning and occasional inspections will keep it performing optimally.
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