That looks like a Beretta 92 with a mean looking front end gas vent. Soooo...I will bite where did you get it from?
What Karma said. It's the Robocop gun, which is based loosely on the design of a real gun (I assume the one you mention, but I'm pressed for time so can;t look it up right now).
Anyways, the Caine_Hazen has is a cheap Airsoft gun. He got it for like $10 on eBay. They're not that much more new (and they are cheap, his broke pretty fast, but since it's mainly an SR prop anyways, not that big a deal).
Bull