I just put up a video on the internal workings of the German FG42 paratroop rifle - really a pretty ingenious design (which, yes, was screwed up and turned into the M60).
http://www.youtube.com/watch?v=KdaUPUZXdSM
You can see the whole Forgotten Weapons page on the FG42 here: http://www.forgottenweapons.com/german-ww2-rifles/german-fg-42/
http://www.youtube.com/watch?v=KdaUPUZXdSM
You can see the whole Forgotten Weapons page on the FG42 here: http://www.forgottenweapons.com/german-ww2-rifles/german-fg-42/