Hiya pauli62 and thanks for starting the thread, great advice from Denn, had czc fit my 3 frames as they are down the street, the shadow was a very tight fit gettin it off at first, po-2,shadow,and 75b-sa being the favorite frame ta use. As a side note, my kadet kit did not lock open with last round, and this was with new mags. I called cz's free toll free line and they offered to send me a PCR slide stop if I return the Kadet side stop as a trade, slide locks back now, unless I've not kept up on mag cleaning. Enjoy, it is alot of fun to shoot with, a lil sweeter if we had 20rd capasity. Be well.