Any thing is "WORTH" what ever someone is willing to pay for it. So may be in this case a used Glock IS worth more than a new one...
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THIS
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I could go back and find every person who I ever sold/traded a gun to if I really wanted to and I've never done a BOS. Everything is logged on here and there are ways of finding that info even if it's been "deleted". If you really think that they can't find out what gun went where if they really wanted to you are delusional.
THIS