Just bought a 23 and understand that I can convert it to 357 Sig by just changing the barrel. I've seen conflicting info on converting it to a 9mm - Lonewolf says yes, just drop in a 9mm barrel. Ultimately I want to stay with the .40 caliber but since I'm new to handguns I thought it might be easier to train in the beginning with 9mm - cheaper and less felt recoil. The armorer I bought it from says no way. What is the "real" answer from The .40 S&W Club ?