Kadet Kit Issues

[Jonzer77]

I just recently received my Kadet kit and I fitted it on my sp-01 but I am having issues with it.  The first time I took it to the range I tried some various bulk 22lr that I have had for a while and after every round I would have to cock the hammer back to fire.  I would fire a round and then pull the trigger and then nothing, pull again and it would fire.  I thought maybe it was the bulk ammo but after some searching I have read that it should be able to fire any ammo.  I bought some CCI 40 gr mini mags and it would do it every 6-7 rounds which is better but still wont run reliably.  I am hoping there is an easy fix and that I just missed something because I have been looking forward to taking my cz to shoot at the small bore falling plate matches at my local club.  Thank you in advance for any help.

[WilliamG]

You need to change the mainspring for the Kadet to work more reliably. I replaced mine with a 17lb mainspring, and while it's not 100% reliable, it's about 97% reliable which is good enough for me. With the factory 13lb mainspring on my Shadow SP01 Custom, it would light strike a lot, exactly as you describe. A second double-action pull would 99% of the time fire the round off.

[Jonzer77]

I took the thing completely apart and pulled out the firing pin to see if I had the old one per cz's advice. I was bummed because I had the correct one and so I gave it a good cleaning and put it back together. I took it to the range and tried a magazine of stingers and I only had the problem once. I loaded a few more and it started firing like it should. Then I started loading the old assortment of bulk 22 and I ran through 100 rounds without a problem.  I was working on a load for steel challenge that day so I didn't have a lot of time to really test the kit but the next time I go out I will see how it handles 200-300.