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Are you asking me? Haha. Some WWII ammunition had corrosive primers. It is therefore necessary to clean the gun after each shooting session to preserve the rifling in the barrel. Modern ammo doesn't have that issue.
A percussion cap? That's pretty ancient history isn't it?
One of the early advantages of the MI Carbine was -iirc -that all the ammo issued for it-unlike the MI Garant-was noncorrosive primed ammo. Which made the weapon very popular in the wet environments of the pacific in WWII and then nam (corrosive primed ammo have salts that attract moisture which causes corrosion to the bore-which is why the COMBLOC rifles that used mainly corrosive ammo, were usually fitted with Chrome lined bores since those were more resistant to rusting from the corrosive Berdan primed Warsaw Pact ammo)