Responses
Because it's a mortar(by the looks of it before the scope was placed) it's meant to look like a big metal tube
except that a mortar doesn't have a scope, or a pistol grip. I think it's just lazy art that couldn't be bothered to look up references (which is kinda common in this series). We can wave our hands and say that it's a mortar/sniper hybrid lol xD
Well the scope came from the sniper (can be forgiven) but the pistol handle and trigger, yeah they lack research
the heck is up w/ that weapon design? it looks like a fat cardboard tube w/ a scope on top...