Which one would it be? For me, there a 2 that come to mind. The first was an H&K P9S in .45acp. It has been without a doubt the single most accurate handgun I've ever owned. I posted in another thread that I could hit the metal "Bong" target on the rifle range and this thing only had iron sights. The second was a collectable, a Walther P-38 AC40 whith a commercial blued finish and matching holster. It rated at 98 to 99%. Someone offered me an obscene amount of money for the time, and I gave in. What gun from your past would you like to have back?