Has anyone had any issues with surface rust or corrosion on a VP9 or H&K in general? I have two, one of which is my duty pistol. I just noticed that the slide stop on both sides is rusting. More so on the left lever. Upon further inspection, I noticed some surface rust on a cocking serration on the right side and also some of my magazines are beginning to rust as well. Like I said, this is a duty pistol so its exposed to some elements; however, its cleaned, oiled and maintained regularly. Anyone else having this issue?