I'm not really working on my Ork army at the moment, but I wanted to put together a Killa Kan just for fun. The latest kit includes a Grotzooka option, which is what I chose to arm this guy with. A Grotzooka is basically a big blunderbuss that fires big gobs of wrenches, scrap metal, nuts, bolts, wire, and whatever else the Gretchin can find to stick in the hopper and send through the air. These photos are not entirely accurate, as after I took them I reposed the legs to lift the airborne one up a little higher. But the general idea is the same.