Well, if they're made of metal wouldn't they survive alongside the dinosaurs' bones? With this in mind, and assuming that gun fossils have never been found (maybe they covered it up?), I think we can say for certain that unfortunately yes, we know this. I'm sorry... I don't like this any more than you.
Nah, it would all rust away, it's why we only have the pyramids from the civilizations that were around before the Egyptians, but not the rest of their tech.
Funny way of saying "desperately holding on to mortal sanity amidst the true reality of non-linear time and its cosmic horror worthy implications" there, but I agree.
