A choke tube is a removable interior tube at the end of a shotgun barrel that controls shot dispersion. Choke tubes typically come in cylinder, improved cylinder, modified, improved modified, full, and extra full. A cylinder choke tube produces a very wide shot dispersion, whereas an extra full choke tube will provide a much tighter shot pattern. Different chokes are used for … [Read more...] about Shotgun Choke Tubes Interchangeability