LUPUS is correct. The GP6 is a version of the GrandPower K100. Here are pics of both:
The STI GP6
The Grandpower K100 Mark 6
The GrandPower company website:
http://www.grandpower.eu/_EN_Menu.htm
The specifications and reliability testing of this pistol seem to be very impressive. It will be interesting to see how the K100 does in the U.S. market. On the GrandPower site, notice that that there are many variations of this pistol including two select-fire versions called the K102R and K105R. Hopefully, we'll see some of these cross the "pond" at some point.
Best Regards,
-Nanotech