I am guessing that building your own AR is going to be cheaper in the long run and way more fun, am I correct? I am wanting to invest in an AR and I am new to this rifle. Should I (since I am a noobie) just buy one from the local gun shop? Or with the help of this awesome forum, should I try to build one myself? I am just unaware of all the parts I will need to purchase. Could someone clue me in and maybe give me a crash course for my fisrt purchase or build.