Stops you having underaged sex, drinking, and smoking. Keeps you fit and gets you out the house. Also gives you a good insight about what the military can be like.
well suppose you could just join a street gang n run with real guns - NO don't say that....
You just have to talk to her in a mature way, go to site and talk to marshals before & after game if you could demonstrate some maturity and all that. Bloody kids you can't just tell the no with full justification these days - but often even us older ones went n done stuff behind their backs all crafty like and I'm sure she don't want you become all crafty n liar etc...
Make it clear guns are something to be respected, not feared, as with any weapon, it's the person that decides to use it to hurt other people, not an inanimate object.
Show that it means something to you and that you are dedicated. You proved this by saving money from car washes and asking advice on here etc. all this shows that you will be responsible about it and have fun
What all mothers love to be assured about.