So I broke out the CZ last month to shoot a little carry optics and thought I was getting light strikes on my reloads. 4 out of 10 stages at the match first round did not go off, pulled the trigger again went bang and kept shooting. Thought it may have been the hammer spring primer combo (11lb, Winchester) although I shot that combo for years without issues. Went to the basement today for a little dry fire and pulled the trigger a couple times in DA and noticed the hammer stop at half cock. just pulled the trigger fast 20 more times or so and I get it to stop at 1/2 2 or three times. I didn't do a lot of experimenting with it but if I gripped it tight and put pressure on the bottom of the left side safety from my normal grip it happened more often.
I've completely stripped it, not reassembled yet!! I admit it was pretty dirty!!! I didn't notice anything obviously wrong but I'm not a gunsmith so maybe I wouldn't. Gun started out as a stock SP01 Shadow, think my list of parts are CZ Comp Hammer, Pre B disco and springs,, all this work was done 12k to 15k rounds ago with no issues. I started shooting limited 2 years ago so not much use out of the shadow. Got the slide milled last year and have taken it out once in a while, maybe 500 rounds in the last year. Same can of reloads I've always been shooting.
Any insight would be appreciated, I'll get it put back together tomorrow and see if I can duplicate the problem.
Thanks