FN 509 10-Round: Striker-Fired Duty Pistol with Ambidextrous Design

When a duty pistol needs to combine modern striker-fired performance with practical, user-focused ergonomics, you want a platform that’s proven and ready out of the box. We examine how a contemporary defender stacks up on features that matter in training, duty, and home defense scenarios.

509 [BLK] *10-ROUND*

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Design and build: compact duty construction with corrosion resistance

Made by Fn, the 509 [BLK] *10-ROUND* continues the lineage from the FNS series as a modern striker-fired duty pistol. Its polymer frame keeps overall weight down for extended carry and handling while offering inherent corrosion resistance compared to metal-only frames — a practical advantage for service pistols exposed to varied environments. The all-black finish delivers a low-profile, professional appearance favored by agencies and civilian owners alike.

Loaded chamber indicator and safety philosophy

The 509 [BLK] *10-ROUND* features a tactile loaded chamber indicator and opts for no manual safety. That configuration emphasizes immediate readiness and a simplified manual of arms, typical for duty-oriented platforms where positive trigger control, proper holstering, and training are the safety backbone. For users who prioritize minimal manipulation under stress, the lack of a manual thumb safety removes a potential failure point while the loaded-chamber indicator offers quick confirmation of status.

Sights, controls, and ergonomics that accommodate many users

Equipped with 3-dot style luminescent sights, the 509 [BLK] *10-ROUND* aids target acquisition in low-light conditions without relying on batteries. The ambidextrous controls are a standout: slide stop and magazine release accessibility for left- and right-handed operators make this pistol adaptable across different duty profiles and team members.

Grip customization and fit

Interchangeable backstraps allow you to tailor the grip to hand size and shooting preference, improving control and follow-up shot speed. For instructors and armorers who outfit mixed-size teams, this flexibility reduces the need for multiple frame sizes while delivering a consistent manual of arms across a unit.

Operational features and what you get in the box

As a semi-auto platform designed to succeed the FNS lineage, the 509 [BLK] *10-ROUND* brings striker-fired simplicity and proven internal mechanics to the table. This particular model ships with two 10-round magazines, making it compliant for areas with magazine capacity restrictions while still providing reasonable reload cadence for defensive use. At a listed price of $639.99, it positions itself competitively for those seeking a duty-capable pistol from a reputable manufacturer without premium optics-ready markups.

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Why Fn’s design matters

Fn has long been associated with robust service pistols and military-grade designs. The 509 [BLK] *10-ROUND* carries that heritage forward by focusing on reliability, controllability, and serviceability. For agencies or individuals who prefer a straightforward striker-fired trigger system without extra appendages, this model checks those boxes while supporting standard maintenance and part replacement practices.

Who should consider the 509 [BLK] *10-ROUND*

Law enforcement and security professionals who face magazine-capacity restrictions or need a consistent, ambidextrous platform will find the 509 [BLK] *10-ROUND* well-suited to duty kits. Likewise, responsible civilian owners interested in a defensive pistol that balances concealability (with 10-round mags) and practical shooting ergonomics will appreciate the modular grip options and luminescent sights for low-light readiness.

Training emphasis should be on trigger discipline, reload drills with the two supplied magazines, and consistent sight picture acquisition using the 3-dot sights. The absence of a manual safety means standard safety practice becomes more focused on muzzle awareness, finger discipline, and holster security.

Maintenance, parts, and long-term ownership

Routine field-stripping for cleaning, periodic inspection of the polymer frame and slide interfaces, and replacement of wear items like recoil springs align with standard semi-auto service. Given Fn’s parts ecosystem and the pistol’s role as a development of the FNS series, expectation for parts availability and service documentation is favorable. Owners should maintain regular lubrication, check the loaded chamber indicator for proper function after cleaning, and ensure magazines are inspected for feed lip integrity and spring tension.

Operational assessment and purchase notes

For a firm, service-ready package, the 509 [BLK] *10-ROUND* is a compelling option in the Semi Auto category. The combination of ambidextrous controls, interchangeable backstraps, luminescent 3-dot sights, and the inclusion of two 10-round magazines provides a practical out-of-the-box solution for those needing a duty-style pistol that meets various jurisdictional limits. At $639.99, it offers modern features without luxury pricing.

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— John Wick & Garand Thumb

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.