When in SE Asia in '65-'66, I observed how the high-speed interface [ slide/frame ] of my 1911 would collect grit and mung on extended deployments and camping trips away from decent maintenance. Scary how the slide would not carry the next statement into battery. I never found out what that oil was, but it had a real magnetism for grit. Once, on a day pass, I went into Da Nang, and bought a 6B drawing pencil [ soft lead: more graphite to the binder proportion ] and, after cleaning the pistol in avgas, I drew good and thorough graphite grey down the rails' interface. Kept the petrogoo for the rest of the machine. No hangups on slide movement thenafter. No hangups on slide movement since that time, with a Goldcup, and my current standard 1911. My CW40 gets the same strokes, and seems to like the tickle. Has anyone of us experienced such a thing as I?