Assault mode. Transformation reminds me of Gunhed. You split apart the legs and pulling apart the side parts roll forward the chest and shoulder cannons. The cannons can't roll into place in robot mode because the side parts block the way.
I think I'll get rid of him eventually. I'm planning to do spring cleaning and this guy's already first on the list. I got the Apex Armor to satisfy my curiosity so now that's quenched, I can get rid of him. :p