Gatling gun
Olefin: Yes, hand cranked gatling guns would be very doable.
I used the electric powered one since, 1) I think in 1999-2000, you'd likely see a electric motor added, hooked up to a car battery. 2) I think it's got more post apoc flavor than a straight hand cranked gun.
Back in the day: My PC designed and had build a 76mm "compressed air" powered mortar that lobbed either molotov cocktails or explosive shells. It had a fairly low signature. I liked it, even though it was short range.
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