Re: Long term storage in plastic cases OK?
That foam holds moisture. It's like a rust machine for firearms. I've seen reports of guns rusting totally within a month of being stored in a foam lined case.
There are specially designed cases where you can store guns without worrying about rust but the cheap ones are not in that category. They generally use cloth instead of foam and they have some sort of silicone treatment to prevent them from retaining moisture and holding it against the firearm. I don't even know where to buy those cases but I know my friend has several of them. You can bet they aren't cheap though.