I just purchased my second glock on Dec 28th. Brought home a gen 4 19 MOS and when I broke it down there was this copper colored grease in the slide and frame. I cleaned it off the best I could and put on my own lube. Shot the next day and then was able to get the rest of it off. But the gunk was now all over my hands. What the heck are they using? That stuff is nasty smelling.