Does anyone know of a longer barrel for my 1st Gen P-3AT? I'd like to experiment with it to see just how much more velocity I can get. And Yes, I know it's probably already been done, it's not worth my time, there won't be that much gained. etc., etc., etc....but humor me. ;D Also, I've got an S2K and ALL the mag catches (NON-GLOCK) to interchange-how does one tell them apart? Which is for Sig? Ber? SW?