I think you guys mean the same thing, but have different definitions of one piece versus two piece slides. I'll add a third. The original Kadet is a three piece assembly, consisting of a barrel, slide body, and a reciprocating "bolt". The barrel and slide body with the sights is pinned together and do not move when the gun is fired. The Shadow has a slide body with reciprocates on each shot, and a fixed barrel, that is, it is pinned to the host frame. The slide body and sights reciprocate on each shot, so the location of the sights relative to the barrel can vary from shot to shot. How much is dependent on the clearances, which can't be very tight on a .22 or the slide body won't cycle far enough to catch the next round.
We'll see. I am definitely glad they came up with the .22 option.
Joe
Based upon the photo in the OP, only the rear sight reciprocates with the slide.
The front sight is fixed in position as is the front (and rear) of the barrel .
As far as lock up, the probability of the Shadow 2 kit locking in the same position every time is likely very close to that of the original Kadet kit, all individual firearm tolerances considered.
It is the rear sight that may not remain in consistent alignment with the front sight, since the Shadow 2 kit does not retain the long, fixed upper rail of the original kit.
It looks like CZ took the original design, split the upper rail just behind the front sight portion and incorporated that into the bolt making it into a reciprocating slide.
They also modified the recoil spring design.
Closer to the original design than the kit for the P-07 (for example) with similarities to both.
This would also explain the pricing being similar to that of the original kit.