The base vehicle employed was the M74I, or an M113 with a modified roof piece and a modified troop compartment, with a system to block the wheels for the firing position. In the center of the roof was placed an open turret for housing the General Electric M6I gun consisting of six 20mm rotating tubes very similar to the weapons designed for the air force jets. The Gatling design type allowed for a firing rate of about 1000 and 3000 rounds per minute. In order to avoid an excessive ammunition use (bear in mind that it held 1900 shells in reserve) it had a selector switch that allowed you to release 10, 30, 60 or 100 shots per round. The assembled unit weighed about 1.5 tons; that meant that flotation units had to be placed on the vehicle's sides in order to maintain its amphibious status.
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