on the subject of why uppers and no lowers - IMO several reasons
-- most likely is guns that were seized by police and the lower is the 'frame' and was destroyed - some places the entire gun must be destroyed and some allow the parts to be payment for destroying the frames. I have a friend who gets guns off and on - I bought luger parts, a 1911 upper from him
--- for some reason the frame was left in water or just was horribly pitted, so people part them out. sometimes its weird the way pitting and rust will affect part of a gun, maybe an upper, maybe a frame
----- probably not too many lugers, but parts could come into the USA a lot easier, so guns were broken down and brought into the USA as parts
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