So, I just bought a xd 40sc but now am moving on to purchasing a new toy. It was between an 870 and a RRA ar 15. So I picked the AR but now I have some questions because I don't know much about them. 1. I have decided to build my own so that I learn as I go. I am fairly technically capable so I the task doesnt scare me. But, do I just need to buy a complete lower and a complete upper or would it be better to get a stripped lower with a parts kit and the upper? 2. Is there a way to avoid extra expenses like taxes? I think I have read that if you buy seperately then you don't pay tax on it... 3. Do I have to have any of the parts shipped to a ffl dealer? Or since I am ordering parts seperately can they be shipped to me? Please feel free to mention an good ideas so that I can expedite the process.