Specialty Sports has a super cool HK Mp5 Rifle chambered in .45 ACP, for $999. It has a fake suppressor that is actually the barrel that is 16 inches long, and a colapseable butt stock. I was looking at it earlier, and wanted it really bad. THe salesman in the store said nobody's really been interested in it. I think it's the shit!

Looks just like this, only without the handgaurd. IT's just all (fake) silencer all the way to the receiver. I suppose you could add the handguard.