How effective would a giant-sized bug's exoskeleton be against firearms and/or blades?

I was curious, since giant bugs appear a lot in sci-fi and fantasy. I also wonder which Earth insects would have the best "armor" if they were, say, a

I was curious, since giant bugs appear a lot in sci-fi and fantasy. I also wonder which Earth insects would have the best "armor" if they were, say, about human sized or slightly larger.

or:I was curious, since giant bugs appear a lot in sci-fi and fantasy. I also wonder which Earth insects would have the best \"armor\" if they were, say, about human sized or slightly larger.

or:It's all fiction, so if a bug wins, that's what the Producer wants.

Tags:sci-fi,