The worst gun I ever had was a G30SF. Fortunately Glock's customer service came through and replaced it with a NIB G30 that ran fine. The second worst was a Springfield Armory 1911A1 Micro GI. It was sent back to Springfield and still failed to run. A braggard at the range offered to buy it saying he could get any 1911 to run. I sold it to him with the warning it was a POS. He doesn't talk to me anymore, guess he never got it to run.