It's a oven... take all the parts out, why take a chance? If you fry them, u'll need to dish out a lot to replace them. I doubt SystemA will cover them when you tell them they fried in a oven^^ Also parts like the hop up will not like a 'hot day in the desert'
And yes that's cheap, just make sure his paint isn't to thick, you don't want the mags to not go in anymore...