Ok guys I want to build an AR, I keep seeing stuff about psa having all kinda deals.. Well I've never done this before and am still sorta new to the AR. So, what do I need, where should I start. I wanna keep this as low a cost as possible. Upper, lower, parts kits, etc.. Got a favorite go to for any of these? Will be shootin steel and brass case ammo. So reliability is a must. Thanks for any help!