Standard 12ga. Extended Choke Tube. Whether shooting clays, hunting waterfowl or woodland game, we have just the standard choke to suit your needs. These standard extended choke tubes features a matte blued finish, and are available in Cylinder, Improved Cylinder, Modified, Improved Modified and Full pattern constriction. Will fit� all Franchi 12 gauge shotguns that utilize standard Franchi chokes.