I just installed a new Kadet II on a CZ75B. I have several versions of CZ's, and was expecting some issues. I ordered pn 01610 after a discussion with CZ. I was told this one worked best in the CZ75B, while pn 01612 is best on the SP-01. It was disappointing that CZ doesn't offer a threaded barrel for the CZ75B, but does for the SP-01. There were duplicate slide stops in the box. Look to be identical to me, so I just used one of them. The Kadet fit the frame without any modification. Loading the magazines, even after modifying my Uplula, is a bugger. I couldn't load the 10th round without the loader. Off to the range. It failed to load the first round. Needed a forward assist. Fired, and the slide locked back. Hmmm. Used the slide release, and fired again. The slide locked back on every round. Fed the rounds fine, very accurate. Just, kind of a single shot. I was lucky enough to come across an auction with two CZ75B's that have consecutive serial numbers. AY179 and AY180. So, I switched the Kadet to the other CZ. Fit fine, no adjustment. Still doesn't like to feed the first round. (I think it's because the mags are so darn tight). Still acts like a single shot, locking back the slide after each round. Now, the original CZ75B slide stop is quite a bit different than what's provided with the Kadet. But, it fits fine with the Kadet. And, wouldn't you know, it functions perfectly with the Kadet on either frame. I was also able to get full 10 round mags to feed without issues. So, I really like the Kadet. Very impressed with the accuracy. CZ, as noted, should improve the installation manual, with info on the slide stops.