FN 509C Tactical 9mm, FDEDescription From the makers of the worlds most battle proven firearms, comes the release of the FN 509 Compact Tactical, the smallest and most concealable 9mm tactical pistol available on the market. Easily deployed as an everyday carry with the standard 12 round magazines or on the range with the extended 24 round magazine. The 4. 3 inch cold hammer forged threaded barrel makes it compatible with todays most popular aftermarket accessories like