Just realised that G1 Springer's gun is meant to fit properly into the roof (on the car mode). I bought one back in 2007 and the gun never fit properly so I never really bothered plugging it in when I'd transform it. But I bought a plastic chest one today from Dirge and the gun fits snugly. I guess my metal chest one must be a mismatch of parts. I just thought it was poorly thought out all this time.