http://arniesairsoft.co.uk/forums/index.php?/topic/209222-kriss-drops-kwa/
Are these still being made,was the reason for the breakup mentioned? I had a quick look but didn't see anything.
I found the patent for this one a while back.The mechanism's fairly similar to the real versionfrom the pictures.
http://www.google.com/patents/EP2578984A1?cl=en