Has anybody experienced Meprolight night sights rusting? I pulled my gun out of the plastic case for the first time in a few months a couple weeks ago and noticed that the Meps on it (especially the rear) had a significant amount of rust and pitting on it. I contacted meprolight in regards to this and was told that I should send them in and that I would probably receive a new set under warranty. Needless to say, I did not get a new set because they said it was just surface rust and that it would not be covered under warranty. I am not so much upset that they rusted as I have since bought another set, but I am curious if anyone else has experienced the meprolights rusting. What can I do to prevent this? I don't typically oil the outside of my slide because it makes it slick, but I guess I'll have to start oiling it if thats what it takes to keep the sights from rusting. Any insight would be great.