How to convince my parents?

I'll be turning 18 in a few months and was looking into buying a gun, i know that at the moment it might not be the wisest economical investment but it is what it is. I'm not an idiot when it comes to fire arms. I have fired plenty, know many people who own them. The problem is my mother said, "your not bringing a gun into this home." which basically means if i want to own a fire arm I'd have to move out. I'm not against, I've suggested this actually but when i did my mom got angry that i would want to move out. I don't know what to do, I've explained that her thoughts were contradicting and to some degree unfair. (Ok before i get any bleeding heart liberals, gun haters, or people that post their opinions instead of answering my question please let it be known; I understand that it is they're house and therefor they're rules. I understand that guns can be dangerous but the truth of the matter is that guns are inanimate objects, it take a human to make a gun kill someone. I KNOW all this, so please if you don't have an answer to my question, don't answer.) My Mom's father was Border Patrol so she has been around guns since she was a child and my Dad continues to hunt with his Brothers so I don't under stand why they would be so against having a gun in the house. So to sum it up, what would you say to my mother (and father) to make them see my side of the story and perhaps even convince them?