simultaneously at stations 1 through 7, and then from station 6 back through either station 2 or 1, depending on the round. The maximum gauge permitted in Doubles is 12 gauge. Each of the five events usually consists of 100 targets (four standard boxes of ammunition). All ties in potential winning scores are broken by shoot offs, usually sudden death by station, and usually shot as doubles, from stations 3, 4 and 5. Tournament management has the right to change the shoot format with respect to the order in which events are conducted, the number of events in a given shoot, and the rules governing shoot offs. Each event normally constitutes a separate championship. In addition, the scores in the four singles events are combined to crown a High Over All ("HOA") champion for the tournament, a coveted title. On occasion, the scores for all five events are also combined, to determine the High All Around ("HAA") champion. The requisite use of the small bore shotguns, including the difficult .410, is a major differentiation between the American version of the sport and the International version. Some would argue that it makes the American version at least as difficult as the International version, though perhaps at greater expense, given the necessity of one or more guns capable of shooting in all events. For practical purposes, there are three types of shotguns if the shooter must have two shots in rapid succession, a requirement for American skeet. The types are: the pump-action, the semi-automatic, and a double-barreled shotgun. A Pump-action shotgun operates with one hand on the grip and trigger, and the other on a sliding wooden or composite forearm. In turn, the forearm is attached to one or two bars that operate the action, both to load the chamber with the first round and to cycle the action after firing, putting another round in the chamber for the second shot. The power is supplied by the shooter pulling the forearm back and then pushing it forward: a process prone to error on the skeet field because it requires speed, consistency, and precision from the shooter. A semi-automatic shotgun has a fixed forearm: it relies on either the burning, expanding, gas from the first fired round, or the recoil from the same fired round, to cycle the action. Such a gun cycles "automatically" each time it is fired: ejecting the just fired,