Q1: So I'm looking for a self-defense/range gun in a medium caliber. This gun would mostly be for range shooting, but would be for self-defense as well. Using this criteria, would you steer me towards a 9mm or a .40 S&W (or maybe something else)? Q2: Since I am under 21, I will have to purchase this firearm via private sale. Therefore; I have two options. -I know a guy who is selling a barely used Glock 23 with 2 mags, and all the original do-dads, for $650ish. -There is a gun show in my town (Milwaukee) in 3 weeks. What is the better option? Getting the Glock, or waiting for a 9mm/something else at the gun show? Where would I get the best price? Your advice would be most appropriated, O knowledgeable pluribus.