Ironhide's head fell off after Sentinel blasted him (uh.... spoilers?), so what if KSI recovered it and created a body for it like they did for Megatron in AoE?

Real world explanation: it's a Marvel crossovers Wolverine with the head from a junker Ironhide. I like how the chest emulates Ironhide's movie look.

Couldn't find any suitable guns in my parts boxes but can fanon he now prefers melee combat.