After a while the cartridges turn green. I remember advertising photographs of a Glock 17 lying in the salt water on a tropical beach.
Where else would one fantasize about needing a Glock pistol? Certainly not a desert or the boreal forest! No, it must be coconuts, Polynesian girls, fresh fruit, fish, wild boars, no taxes or rent, and certainly no phones, no lights, no motor cars, not a single luxury. However in this fantasy there are probably cannibals that sail to the island from a bad island looking for long pig! That is when the perfection of the Glock will shine. The Glock will be cracking and the cannibals will be dropping like flies and littering the beach where you found the pistol (right at the water line so it was only half submerged). Their spears and arrows would be no match against the Glock. Seventeen cannibals would alighted from their outriggers to attack your village of girls and seventeen would litter the beach in various poses but all with a neat black hole in them. Smoke curled from the muzzle of the Glock 17 pistol. Thank God it was not a Canadian pistol or you would have had to face the remaining seven cannibals empty handed.The girls would then all chant, quietly at first so that it was no more than the sigh of the wind. The chant would become a murmur and then a full throated cry and chorus of "Glock Perfection!" "Glock Perfection!" "Glock Perfection!" Well at least in the advertising video. It still would not be as bad as the PPS-50 photo of a man carrying that 22lr ppsh wannabe running down a little creek with napalm exploding behind him.
Well the pistol can take the abuse but honestly the cartridges may not be able to be submerged a long time in salt water. What about nickel plated cases, and cupro nickel bullets sealed with a bit of tar substance and special sealant for the primer?