I've had my eye on this system for a while now. Been using their G30 mag extensions with my Glock 21. Now that the Civi approved semi-auto model is available I might end up having to bring one home to keep my Ps90 company.
Check it out at: http://www.kriss-tdi.com/products/kriss ... 5-acp.html
Here's a video of the LEO/Military model: