just thought I would bring this back from the dead and do an update on the Kimber with S&W receiver.
The Kimber will accept the GSG or Sig magazines from there .22LR. They are superior in all regards to the marginal Kimber poly mag and way better than the Promags sold to work with the Kimber.
It does hold the slide open on the last shot and they fed well. That and the fact you can use Taylor Tactical and increase the rounds in the mag to 13 or 16 or 17. I have the 16 round mags. The Kimber is more accurate than the GSG or Sig but no where near as good as my Ruger MK1 bull bbl.
Hope that helps as an update...