[Autumn]

I can note out what I found out in more detail yeah, here's what I've noticed:

-Revolver Raid Cannon can use shell effects like a gun should be able to, MG Shell effects specifically.
-It has the same basic attack as a gun should, with a gun symbol and headshot as its special attack
-Gun specific skills such as parting shot cannot be used
-However Fist weapon skills (as if you were equipped with a bare fist) can be used.
-Any fist weapon skill will use the revolver raid cannon to scale with. (Kadouha, Axe Kick, Heaven kick etc.)
-Any passive that is supposed to work with fists specifically (such as Serpent Strikes, Trained Fists, Weathered body) will not work.

This is all I can tell from testing with it for quite a little while, the setup I was using was Monk/MG, but I also used Verglas/MG to see if that worked at some point.