If any of your guns have wood ‘furniture’, be careful not too keep the humidity TOO low. I’ve heard it can cause the wood to dry out and crack over a long period of time if the air is too dry. I don’t have this problem as ALL of my firearms have black plastic/polymer that makes them look “dangerous” to Liberals and idiots(please pardon the redundancy).
My Garands I have oiled with unboiled linseed oil, as with the carbines and 1903s....others have been sealed pretty well, too. In the 10 years I’ve been doing this, no cracks or splits yet...(fingers crossed):o)