FN 509 10-Round Pistol: Versatile & Concealable Defense

When you need a carry pistol that balances duty-grade performance with everyday concealability, choices narrow quickly. In defensive situations you want a platform that’s predictable, rugged, and adaptable to different users and optics setups.

FN 509 MIDSIZE MRD [BLK] *10-ROUND*

Shop this product here: Shop this product

Overview: Built for Duty, Sized for Concealment

The FN 509 MIDSIZE MRD [BLK] *10-ROUND* is the logical evolution of FN’s proven FNS series — a striker-fired system refined for modern defensive requirements. It blends a duty-level feature set into a 4-inch-barrel midsize package with a shortened grip, making it easier to carry concealed while keeping controls familiar for users trained on full-size platforms.

Key Features and What They Mean on the Range

Striker-Fired Reliability

Like its predecessors, the 509 uses a striker-fired trigger system designed for consistent pulls and predictable reset. That predictability translates to faster follow-up shots under stress and confident transitions during defensive drills.

Optic-Ready Slide (MRD) and Sight Co-Witness

The MRD series comes with an optic cut on the slide to accept FN adapter plates — a practical choice if you prefer a red dot for faster target acquisition. FN ships the pistol with suppressor-height iron sights that are set up for proper co-witness with most micro optics, so you won’t lose sight alignment when mounting an optic. Note: optic not included.

3-Dot Luminescent Sights

Out of the box you get 3-dot luminescent sights for low-light visibility. Those dots make sight picture acquisition quicker in dawn or dusk conditions and give you confidence when the light goes away.

Polymer Frame for Reduced Weight and Corrosion Resistance

The polymer chassis keeps the pistol light on the holster and naturally resistant to corrosion. That makes the 509 MIDSIZE a realistic option for everyday carry where sweat, weather, and hours on a belt matter.

Ambidextrous Controls and Interchangeable Backstraps

Ambidextrous slide stop and reversible features ensure the pistol works for both hands. The interchangeable backstraps let you tune the grip profile to your hand size — a simple detail that pays dividends in control and recoil management.

Design Details That Matter

4-Inch Barrel and Shortened Grip

The 4-inch barrel keeps ballistic performance close to full-size duty pistols while the shortened grip reduces printing and makes concealment more practical without sacrificing magazine capacity options. This configuration is ideal for shooters who split time between carry and range duties.

No Manual Safety

This model is configured with no manual safety to preserve a clean, consistent draw-to-fire workflow favored by many defensive shooters. That decision emphasizes training discipline and a strong focus on safe handling practices.

Included Accessories and Pricing

The package includes two 10-round magazines — a practical loadout for jurisdictions or users who prefer limited-capacity carry. Priced at $725.99, the FN 509 MIDSIZE MRD [BLK] *10-ROUND* sits in a competitive bracket for optic-ready midsize pistols with duty-grade features.

View product details and pricing: View product details

Who Should Consider the FN 509 MIDSIZE MRD

– Concealed carriers who want a duty-capable platform with a reduced grip profile.
– Shooters who plan to mount a micro red dot and want suppressor-height iron sights for co-witness.
– Users who value ambidextrous controls and modular grip sizing for family or multiple-operator use.

Training and Practical Use

Get familiar with the optic-ready slide, practice transitions between sights and potential red-dot mounting, and use the included 10-round magazines to build realistic reload drills. The polymer frame keeps recoil manageable for quick follow-ups during dry-fire and live-fire drills.

Durability, Maintenance, and Customization

FN designed this platform for real-world use. The corrosion-resistant polymer frame and robust slide cut make it a solid base for suppressor-height setups and everyday carry. Factory parts and aftermarket adapter plates increase your options for optics and holster solutions.

Final Thoughts from Two Operators

John Wick: As someone who values a pistol that points naturally and functions without drama, the 509 MIDSIZE MRD’s blend of ergonomics, optics readiness, and low-profile carry capability is compelling. It’s a familiar striker-fired feel with modern features you can put to work.

Garand Thumb: For shooters focused on practical performance and adaptability, the MRD cut and suppressor-height sights make the platform future-proof for optics. The included 10-round mags and polymer frame make it a realistic carry option in many scenarios.

Check current availability and purchase options: Check availability

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.