Here is a slightly different view of the movie luger. Part 1 appears to be coming out of the frame and looks like a hook. Part 2 is sticking out beneath the barrel and part 1 it hooked into it. Sorry I don't have a clearer image. Maybe I'll have to get it on DVD and see if it is better...
<a href="http://boards.rennlist.com/lfupload/MovieLuger2.jpg" target="_fullview"><img src="http://boards.rennlist.com/lfupload/MovieLuger2.jpg" width="400" alt="Click for fullsize image" /></a>