There`s a good chance you`d break any AEG if you fell on it. How bad depends on the particular model and the situation. I wouldn`t worry about it too much, unless you`re really klutzy. I haven`t heard of very many players breaking guns falling on them, bits and pieces of the guns, yes (both metak and plastic based guns), but like snapping it in half, rare. If you break it, just get Age Verified (if you`re not by then) and buy a metal replacement in the classifieds.
ASC Age Verifier for Red Deer & Area Alberta