Spend your money on practice and training. Forget the "accessories".
Are these pistols causing you recoil pain/problems now? My advice (for what it's worth) is to learn to control & shoot these pistols in Stock Configuration (maybe an extended G34 slide release). There always time to dink around with them AFTER you've practiced enough to be very, VERY good.How useful would these systems be on say a G21 or G19?
how is the accuracy of the KKM barrels?