“technological advanced”?
First, no editor to check basic grammar? And second, in a shooting magazine no less, what’s so advanced about a rotary cannon? Other than the motor, it uses the same mechanism that guns in the 19th century used.
I remember reading, IIRC in the 1960s, some ordnance guy wondered what a motor hooked up to an old Gatling Gun would do. I believe they had one in 30-40 caliber. He lit it off and burmed out the barrels.
[Sidebar] Back in the '50s you could get a 45-70 Gatling Gun barrel from Bannerman's for a few bucks. They were selling them as potential bull barrels for Remington Rolling Blocks.