I bought a standard 75B in 9mm, maybe 8 years ago. Then I bought the Kadet kit specifically for the 75B frame. This is the all steel, $400, .22 conversion. The 9mm slide wasn't very accurate due to a loose fit barrel bushing. I pretty much put the 9mm slide aside and left the Kadet kit on the 75B frame. I converted it to SAO myself and added some CGW hammer and sear parts.
I added a picatinny rail section from Academy Sports to the top of the Kadet slide, me drilling and tapping the holes after removing the barrel, using a drill press. Put the Microdot red dot on that rail. Shot the gun a few times with the new red dot, put my current bullseye match gun in the safe and started shooting the Kadet conversion 75B in all the bullseye matches from that time on. I've used Norma Tac22 and Match ammo in the pistol exclusively for many years. I use the Match at 50 yards, and the Tac 22 at 25 yards.
The original 75B 9mm slide got a CGW 10x bushing a few years ago and it is now just as accurate as my P-09 and P-10F pistols, and is my backup for a 97B"E" for centerfire bullseye matches.
Joe