Seems to me that the Kadet wouldn?t run very well on that frame since the stationary upper tabs don?t engage at all and the weight is supported by the Kadet slide (moving portion). Sort of a wonder the Kadet mag fits in there, too. Given what was done to that trigger guard and some of those scratches you gotta wonder what got hacked in the magwell to fit the more modern mag. That seems a heck of a high price for something that?s been effectively stripped of its collectible value.