So now that Dr. Worm is an journalist, I figured he needed a radio to transmit just stories. Now, there IS an antenna available for the EVO drone. So I present to you my Beautiful Butterfly.
It might be recoilless. There seems to be an exhaust nozzle on top. A recoilless antitank rifle actually did exist. Wasn't an autoannon, though.
Recoilless weapons are remarkably common. The AT4 is actually a recoilless launcher, as was the Panzerfaust. Plus most actual rocket and missile launchers use the same basic principle. On an autocannon though, it may be a bit more complicated. So... Is probably the best answer.
Very nice!!! It's got a big muzzle brake and a recoilless vent like the Croatian RT20. Plus, being semi-auto means that some of the recoil force is used to reload the weapon. A Barrett .50 actually only kicks about as hard as a shotgun because of the big muzzle brake and semi-auto worky bits. Adding a recoilless venturi to the back gets the total down to a reasonable level despite being something like a 25mm cannon.
Did this bad boy back in April for a 400 point limited insertion tournament. I ran 2 TAGs and 4 bikes because I'm an idiot. It was fun though! His helmet horns are the guard from the weapon.