False Alarm!! I stripped it down tonight and nothing's cracked or broken. That's good news! What you see in the pic is lithium grease and a hidden piece of metal or other trash that was causing the trigger to click. Perhaps something was stuck in the grease and eventually moved to a position where it would become audible and gritty is my guess. I never could find the source. I cleaned everything really well, took a stone to anything rough (wasn't much needed) and gave it a good lube with both Militec-1 grease on the rails and MotorKote everywhere else. She's smooth as butter. Sorry if I excited you folks about the CM9 having a problem, and probably should have stripped it down for inspection before submitting that first report! Oopsie! :dejection:
Hey, BTW, getting that trigger spring and spacer back in was a chore, but think I figured out the trick to it, besides some luck... Not sure if I can easily describe it, but it involves growing an extra hand!