Ok here is my situation, my dad and I were planning on attending a gun show this weekend but due to circumstances I can go and he can't. He had planed on selling a handgun there, would it be legal for me to sell it there for him? I am 18 years old and live in Missouri. I know that there is a federal law prohibiting the sale of transfer of handguns to minors under the age of 18 and regulations prohibiting people under the age of 21 from BUYING handguns but what about SELLING? Under Missouri law since I am in the National Guard the age limit for obtaining a CCW permit is lowered to 18, so I would assume that possession of a handgun by someone between 18 and 21 would be kosher but what about selling one?