FN 509 Compact 9mm 3.7″ FDE | 66100818

The FN 509 Compact is a reduced-size 9mm designed to deliver full-sized ergonomics in a concealable package. It features a 3.7-inch cold-hammer-forged barrel, a Flat Dark Earth polymer frame with an accessory rail, and low-profile snag-free sights suited to carry. The pistol ships with two magazines, interchangeable backstraps, and a soft case. A compact red-dot such as the Trijicon RMR Type 2 or Holosun 507K pairs well with this platform and remains priced under $1,000.

Product Specifications

• The manufacturer is FN America / FN Herstal.
• The model is listed as the FN 509 Compact.
• The UPC is 845737012816.
• The caliber is 9mm.
• The barrel measures 3.7 inches and is described as cold hammer-forged.
• The frame material is polymer with a Flat Dark Earth finish.
• The slide material is listed as stainless steel with a Flat Dark Earth finish.
• The listed weight is 25.50 oz.
• The product ships with two magazines consisting of one 12‑round and one 15‑round magazine.
• The maximum magazine capacity is listed as 15 rounds.
• The sights are described as low-profile with a High-Viz front dot.
• The pistol includes a MIL-STD-1913 accessory rail on the frame.
• The finish and frame color are both Flat Dark Earth.
• The overall length is listed as 6.8 inches.
• The product is noted to include two interchangeable backstraps and an FN soft case.

This compact 9mm is intended for everyday carry and range training where a smaller footprint with favorable ergonomics is desired. The FN 509 Compact balances concealability with controllability and accessory flexibility; the 3.7″ cold-hammer-forged barrel and textured polymer frame make it suited to regular carry and dedicated practice. Its low-profile sights and 1913 rail support optic and light configurations for users who want a compact, adaptable pistol.

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