I think it was a glock 18.....
http://en.wikipedia.org/wiki/Glock_18Like this? It's basically very similar to the GLOCK 17 apart from the select fire mode.* They're an interesting gun, but a full auto pistol is a kinda dumb idea, so I never understood the purpose of the thing. (I mean from an aim perspective. The little son of a bitch rides up like all hell, and you don't have any weight to slow the process down. Might as well close your eyes and pray rather than aim the thing.**) You can get high cap mags for any GLOCK. I've got a bunch of 30 rounders.
*Obviously a major difference.
** Here's a video of one in action. Even with a stock attached the thing rides up like a mother.
http://www.youtube.com/watch?v=kBjUDCyDCuI[youtube=425,350]kBjUDCyDCuI[/youtube]
Another video of a guy shoot a hell of a lot of rounds and missing like crazy from about 20 feet.
http://www.youtube.com/watch?v=CFYciQPosQ8[youtube=425,350]CFYciQPosQ8[/youtube]