The dumb mistakes come with the practice of swapping Guns, in close to 50 years of this game, I have made some un believable deals, A colt US Army 1911 - 5 digit serial number , for $300.00. Last year I bought a collection of 3 guns, from My wife’s boss, A Sig, Glock, and S&W, for way below cost, But then you get Brain freeze and do something dumb, I passed on a M1 Garand, also for $300.00 I still don’t know what I was thinking on that one, I just plain was not, Back in the 70 a friend had a Ruger 10-22 he needed money wanted to sell me it for $25.00, I talked him into keeping it I thought, next time I saw him, he had sold it to someone else for $25.00,. So you win some, and some times you just plain mess up. But its still fun Wheeling and dealing with Guns. All you can do is hope at the end of the game you come out in the plus column.