I have stored blued and stainless handguns for upwards of 10 years in a safe deposit box with no problems. After I clean them before storing, I leave a little (very little) oil in the barrel and on other internal parts.I do not disassemble the guns but I do wipe all exterior surfaces with a silicone rag and wrap them completely in another silicone rag and then place them in paper bags.
Before I used this method, I sprayed them with WD-40 (a lot) and sealed them in ziplock bags. No rust but you wouldn't believe what WD-40 turns into after about a year. What a mess. Don't do that.
I have used those Bianchi blue bags also and had good luck with them although I haven't seen them for sale for a long time. Can you still get them?
[This message has been edited by bubbaturbo (edited January 04, 2000).]