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This is some thing I can just barely remember being described to me, it's an old prototype Soviet machinegun, with the name Slostin attached to it.
It's in 7.62x54mmR, naturally, and it has multiple barrels in a rotating, cycling assembly, and multiple gas pistons for each barrel, and as I recall as the assembly rotates, the barrels chamber and then fire, the gas piston drives the assembly to rotate further, and as it goes it unlocks, extracts, ejects, then takes a new round from the belt and chambers and locks, doing this in sequence, going faster and faster with each fired shot.
In principle, it's a lot like an American Gatling, only instead of being handcranked, or driven by an electrical motor, it's powered by the gas of the cartridges, the assembly also isn't solid, rather they are linked together and go back and forth as it goes through its cycle.
It was very complex, and as it fired it would eventually build a top cyclic rate of 3000rpm.
Evidently, they didn't do much with it, probably because it would be ridiculously expensive and difficult to build, and there likely wasn't a practical application for that rate of fire at the time.
Much much later, a different multiple barrel gas operated machinegun was devised for Soviet aircraft.