Quick Look

The FN America FN 509 debuted in 2017 as a rugged, striker-fired pistol designed for tactical and duty use. It emphasizes military-grade durability and ease of customization. Today, the FN 509 is popular with law enforcement and civilian shooters seeking reliability and innovation.

Why It's a Top Choice

• Exceptional reliability under harsh conditions
• Modular grip sizes for personalized comfort
• Optics-ready slide for red dot mounting
• Striker-fired consistent trigger pull
• Comprehensive aftermarket support

Key Variants

FN 509 Tactical

Built for duty use with threaded barrel and enhanced sights, favored by tactical operators.

FN 509 Compact

Ideal for concealed carry with reduced size and capacity while maintaining full-size performance.

FN 509 MRD

Designed with several optics cut options to fit micro red dot sights for faster target acquisition.

Competitor Comparison Table

Feature	FN 509	Glock 19	Sig Sauer P320
MSRP	$699	$599	$649
Capacity/Size	17+1 (9mm)	15+1 (9mm)	17+1 (9mm)
Weight	26.6 oz	23.65 oz	29 oz
Optics-Ready	Yes	No (Gen5 models yes)	Yes
Trigger Type	Striker-fired	Striker-fired	Striker-fired
Notable Pro	Modular grips, high capacity	Simplicity, vast aftermarket	Customizable trigger, ambidextrous
Notable Con	Heavier than some competitors	Less grip modularity	Reset can feel long

Best Use Cases

• Law enforcement duty and tactical operations
• Home and personal self-defense
• Practical and competitive shooting
• Range training and practice
• Firearms collection

FAQs

Can I mount a red dot sight on the FN 509?

Yes, the FN 509 features an optics-ready slide compatible with popular micro red dot sights for quick target acquisition.

What is the standard magazine capacity of the FN 509?

The standard magazine capacity for 9mm FN 509 models is 17 rounds plus one in the chamber.

How heavy is the FN 509 compared to other pistols?

The FN 509 weighs approximately 26.6 ounces, making it heavier than a Glock 19 but lighter than some full-size duty pistols.