The FN 509 Full Size MRD pistol in 9mm with a Flat Dark Earth finish (brand part no. 66-100723) is a duty-size striker-fired pistol with a mini red dot optics mounting system, giving shooters a full-size platform ready for a red-dot sight out of the box. FN America builds the pistol with a 4.5-inch barrel, front and rear cocking serrations, and interchangeable backstraps for a tailored grip fit. The trigger pull runs 5.5 to 7.5 pounds with no manual safety, and the pistol is fully ambidextrous with a loaded chamber indicator. Two magazines and a soft pistol case ship with the pistol. Among optic-ready semi-auto handguns, this 509 Full Size configuration favors duty and home-defense shooters who want red-dot compatibility.

Key Specifications

• The chambering is 9mm.
• The capacity is 10 rounds.
• The barrel measures 4.5 inches.
• The finish is Flat Dark Earth.
• The slide is optic cut and serrated, supporting a mini red dot mount.
• The trigger pull runs 5.5 to 7.5 pounds, with no manual safety.
• The controls are fully ambidextrous, with interchangeable backstraps.
• Two magazines and a soft pistol case ship with the pistol.
• The unloaded weight is 26.9 ounces.

Frequently Asked Questions

Does this pistol have a manual safety? No, it relies on the striker-fired trigger system without a separate manual safety lever.

Is this pistol optic-ready? Yes, the slide is cut for a mini red dot with a low-profile mounting system.

Buy the FN 509 Full Size MRD Pistol, FDE

A full-size, optic-ready platform with fully ambidextrous controls is exactly what this 509 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.