This question would best be answered by an attorney and not people on the internet. That being said I think you are fine to own a firearm, but I'm a guy on the internet and not an attorney so don't take my word for it.
I'm gonna stop you right there, you just said an AR-15 is a high-powered rifle. It is obvious you don't know anything about guns and I shall ignore anything you say from this point on.
Seeking legal advise on the internet is about as helpful to you as seeking medical advise. Speak to an attorney, in Kali, that deals with firearms laws...Please. I would hate if you got bad advise here.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball