I have been shooting Blue Bullets for 3 years now with 0 major leading issues in my open guns or either of my PCC guns. My MPX has a Sig226 X5 comp on it, and it cleans easily with only a brass brush, after soaking it for about 45 min in a 50/50 solution of apple cider vinegar and peroxide. The open guns, usually only have a little carbon build up, but for the small amounts of lead, I do the same. 50/50 apple cider vinegar, and peroxide. Soak it while u clean up the gun, and use a small pick to knock the build up out.... good to go. I also spray the comps before each match with a little Dillon case lube to help the build up from happening. Seems to work pretty good.