As a follow-up, I finally received my Kadet PCR slidestop. The first order was apparently never sent out from Kansas but it's finally here and at no charge. Thanks to all who posted and helped me out in this thread. Instead of Leshka's modification, I lessened the tension on the slide stop retaining spring just a little as suggested by a couple of different threads in this Kadet forum. Function checked with snap caps and achieved hold open on empty magazines. I'll have to try this at the range to be sure but it looks like this'll do the trick. It also looks like this new slidestop will also work with the 9 mm PCR slide. Thank Leshka for starting this thread.