This is actually a M61A1 20mm rotary cannon.
It can safely fire 6000 rounds a minute.
I don't know about navy/Marine fighters, but in the Air Force the rate of fire and duration can be controlled. (3000 rpm or 6000 and the burst can be set to unlimited,(will keep firing as long as the trigger is depressed)2 second or 1 second bursts. (pilot has to release trigger to shoot again))The large drum is for the ammunition and, the steel belt like items coming out of the drum are the ammo feed and return chutes.
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Photo taken in Miramar, San Diego, CA, USA
Misplaced? Suggest new location