The Franchi Extended Mobil 20ga IM Black Choke is an extended-length Improved-Modified choke tube intended for 20-gauge Mobil/Instinct style barrels. The IM constriction tightens patterns for mid-to-long range work—useful for waterfowl, turkey at moderate distances, or clay targets—while the extended profile provides extra clearance at the muzzle for smoother shot exit and easier follow-ups. Finished in a durable black coating for corrosion resistance, it installs using standard choke threads and is removable with a choke wrench. Franchi Shotguns Franchi Extended Mobil 20ga IM Black Choke 51575