FN 509 MIDSIZE MRD for Sale

Quick Look

The FN 509 Midsize MRD was developed from FN America's 509 series, originally designed for the U.S. Army's MHS competition. It delivers striker-fired reliability with a mid-frame balance ideal for concealed carry and duty use. Today, it occupies a strong place in the optics-ready defensive handgun market, favored for its modularity and out-of-the-box performance.

Why It's a Top Choice

• Factory optics-ready slide with multiple mounting plates
• Improved grip texture and ergonomics for better control
• Enhanced trigger over earlier FN 509 models
• Mid-size frame balances concealment and shootability
• Trusted by law enforcement and civilian carriers

Key Variants

FN 509

Standard full-size pistol, ideal for duty and home defense roles.

FN 509 Tactical

Includes threaded barrel, suppressor-height sights, and expanded optic compatibility.

FN 509 Compact MRD

Shorter grip and barrel for deep concealment and CCW users.

FN 509 LS Edge

Long slide variant designed for competitive shooting with enhanced trigger and performance parts.

Competitor Comparison Table

Best Use Cases

• Concealed carry
• Home defense
• Police or security duty
• Range practice sessions
• Optics-enabled handgun training

FAQs

Can I mount a Trijicon RMR on the FN 509 Midsize MRD?

Yes. It comes with a mounting plate system compatible with Trijicon, Leupold, Vortex, and others.

What is the trigger pull weight on the FN 509 Midsize MRD?

Factory trigger pull is approximately 5.5 to 7.5 pounds depending on the lot and model generation.

How does the FN 509 Midsize differ from the Compact?

The Midsize has a longer barrel and grip for better handling and increased magazine capacity.