When I managed to get hold of a Generations Thunderwing, the spring loaded guns he came with were a bit poor, compared with the rest of him Remembering an old comic of Thunderwing chasing down Nightbeat, Siren & Hosehead, he had a seriously cool weapon, which I took as my inspiration. The gun can split into two halves and stow underwing. The photo's are showing Slugslinger wielding the mighty cannon... (I can't seem to find ol Thunders. DOH) Hope you all like!
It is available on shapeways. If you search cyclone cannon. The metallic grey material is no available any longer though.