It was recently advised that the ammo in the pix attached was in very poor condition and looks old. The reason I'm asking is I'm trying to zero in on an issue (case not exiting fast enough) possibly unrelated to the question. So when is 4 year old ammo too old? When it gets a few microns of oxide on it because it has been stored in loaded Gen 2 or 3 PMAGS? Should ammo that has this discoloration not be fired in modern sporting rifles? Should it only be stored in the original cardboard, plastic or metal shipping contains as opposed to in a magazine? I have noticed that ammo kept in PMAGS get this discoloration faster than the ammo kept elsewhere.