The FN 509 Midsize is a striker-fired 9mm pistol designed to provide full-size performance in a more easily concealed format. Its four-inch barrel and midsize frame offer a practical balance of shootability, capacity, and everyday carry comfort. Improved controls support easier manipulation, while enhanced texturing on the included polymer backstraps helps improve grip security and recoil management. The flat-faced trigger promotes a consistent, controllable press and a clean break. This no-manual-safety configuration ships with 10-round magazines and is compatible with other FN 509 magazines when used with the appropriate sleeve.

Key features

• Four-inch barrel and midsize frame balance concealability with practical shooting performance
• Striker-fired semi-automatic action with an integrated trigger safety
• 10+1 capacity in the supplied 10-round configuration
• Optics-ready slide supports the addition of a compatible red dot sight
• Three-dot sights provide a clear, familiar sight picture
• Enhanced grip texturing and two included backstraps improve fit and recoil control

The FN 509 Midsize delivers a practical combination of carry-friendly dimensions, dependable controls, and full-performance 9mm capability.