Present a logical position. Pay for it with your own money. Demonstrate that you know the basic rules of safety.
By showing her you deserve one.
If you want to convince yoor mum to let you buy a BB gun then you should do some research or make some point on why you should have the gun i.e safety!
convince herif it doesn't work convince your dad
Tell her you are responsible
Brownose
Just keep asking her about it. It actually took me three years to convince my mom and dad to let me get my bellybutton pierced.
If you want to convince your mom to take you to the Vmas 2014, just talk to her about it. Ask her if she has ever thought about going and if it sounds like something she would enjoy. Then tell her that you think it would be a really cool thing for the two of you to do together. Tell your mom that you will do whatever it takes to get to go to the Vmas. The best way to bring it up is to just start out by asking her if she likes the Vmas and then just take it from there. Good luck.
sorry but that really depends on your mom....
Just ask her for one
Move out.
Buy your own
You can convince your mother by letting her know that you are responsible.