I would give it high piercing, super high ammo capacity (shoot for a minute or longer straight), crazy long cooldown/reload (slowest reload in the game), very long distance with insane spread. Like, so insane that you have to be scraping paint in order to have 100% hit rate. At 800 meters, you could still hit, but it would be like 1%. Would be great shooting into a group of enemies at mid range. And the firing effect would be terrifying, seizure-inducing screen shake and smoke... lots of smoke.