I am looking to make my first firearms purchase, and was considering the Colt .22 AR-15. (a store near my city has one for sale for $500.) My dad was a Marine and a few of my friends are gun nuts, so i have been shooting before. But i want to something i can learn with, as far assembling, cleaning, shooting, etc. without worrying about price or doing permanent damage to it. I also just want to have fun, with some casual shooting. But i am concerned with home security, its really not the main priority, but i might as well consider it. I like what ive been hearing about .22 caliber rounds, but im still no expert.. I'm pretty sold on it, i just want to know if there are any glaring issues with ithis rifle. any advice would be appreciated.