My CZ 85 is the one I sort of rebuilt and had cerakoted two tone a few months back by Primary Machine. I have no idea why the dogs "wanted" that pistol so bad when I wore it yesterday morning but I noticed it had a gritty sound when I cocked the hammer (after field stripping it this morning). I could not see anything in the action that would make that gritty sound but I sure could hear it.
I tore it down, removed safeties, sear cage, grips, firing pin spring and cup/lanyard loop and went through it. It had a few grains of burned powder (counted 3, one was pretty green color, one sort of tan/gold and one dirty looking) that I got out of the sear cage with a steel pick. There was also some oil/crud her and there and I picked and scraped and wiped till I had it pretty clean. I put it all back together, lubing as I went and cocked the hammer again. DARN!!! That gritting noise is still there!!
Man, I couldn't believe I'd missed any dirt/crud in it so I started to take it back apart again. I got one grip panel off of it and put it up to my ear and cocked it slowly and I could hear the gritty noise much louder (soft rubber grips).
It was the hammer spring rubbing the sides of the spring cup/lanyard loop. No noise from hammer down to half cock. Gritty noise from just after half cock to full cock. I'd never noticed it before. The hammer spring rubs the spring cup. Anyone ever polish that area before? I'm sure it doesn't affect single action trigger pull, the spring is already compressed and the rubbing is done. I kind of wonder if "slightly" affects double action trigger pull.