The destructive power of Russian guns/cannons

[swiss]

Originally Posted by WTE_Galway

In retrospect its kind of lucky the Luftwaffe did not push to make the Mauser MG 213C 30mm single barrel revolver cannon operational, else late war would have seen the Reich defense equipped with the equivalent of a 30mm Aden.

I wonder why there wasn't a gatling gun in WW2.