Very heavy semi-automatic rifle. Intended to be used by heavy cyborgs or power armored troops. I have no idea what calibre the round might have, but the drum's supposed to fit eight of them. Done in PMG.
Well it was inspired by a gun I saw somewhere ( don't remember where) and the information about that gun said it was chambered for 20mm rounds. But since I didn't know how big they'd have to be, I made my own .