So it's a semi-fixed barrel design? (barrel doesn't tilt or have anything to do with the recoil operation, just a straight blowback of that section of the slide that contains the firing pin/extractor?)
I have a KADET kit on my CZ, which works the same way (I'm pretty sure), and it's been 100% reliable except for the odd misfire (rotate the round, hit it again and it goes off) that happens with any .22.