Over the years I have seen enough guns rusted from people storing them in a holster or gun rug so I can assure you it is a bad idea. Holsters are for carrying a gun on your belt, not for storing it. Besides the fact that leather and fabrics will absorb moisture from the air on a humid day some types of leather are tanned by using salt and chromium compounds that will attack the steel. Most holsters are oil tanned but you really don't know what you're buying unless the manafacturer states what it is. Store it in open air in air that you are comfortable in, on a hook or shelf or in a drawer (no basements or attics). Keep it oiled. Wipe it down after handling it. (your sweat is corrosive) Verdigris does not form on steel, just on copper or brass.
Last edited by drail; July 27, 2012 at 04:47 PM.