From the pictures the shot gun appears to be more of a "zip gun" - a home made/improvised gun. The barrel is a tube while the shells seem to have some kind of squib or electric match replacing the shells percussion cap. That removes the weight of a mechanical gun mechanism with firing pin. This feels like a case for moving towards electronic firing case-less ammo perhaps?
Not to rain on the parade...but this is innovation with a very small "i". Aircraft using guns against each other was SOP in WWI, and they were already using recoilless (in the air) back then.
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[ 3.1 ms ] story [ 17.0 ms ] threadIt's recoilless with two cartridges firing in opposite directions.
It can also work autonomously from 126m.
Very cunning this Ukranian tech.