There is no practical way to fake a g33/40. One look at it and the buyer can see if it is real or not. Even owning a machineshop myself; it is not worth the time to try to reproduce what the germans did.... all the lightening cuts etc. way too much time involved. I can make easier money (and faster) doing legit work.
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Believe it or not, it's happening on Gunbroker and Auctionarms with people bidding on Fake G33/40's.
To an untrained eye, if you don't know what you're looking for, you'll get burnt.