Standard 12ga. Extended Instinct SL Choke Tube. These steel standard extended choke tubes feature a chrome finish, and will fit all 12 gauge Franchi Instinct SL shotguns. Available in Cylinder, Improved Cylinder, Modified, Improved Modified and Full pattern constriction. The chokes are knurled for easy threading and unthreading. Whether shooting clays, hunting waterfowl or woodland game, we have the perfect choke for your Franchi Instinct SL.