I'm just about to order the first parts for my build. Everything so far is from PSA, although I'll be looking around for Olive Drab furniture and a stripped lower. I've never built an AR before, but my buddy who's was an armorer when he was in the army is gonna go through it with me. From what I've gathered all I'll need is what's below, plus a stripped lower, and furniture. Am I missing anything? (UPDTAED SHOPPING LIST ADDED BELOW) I just want to make sure i'm not missing anything. I'm sure people have been over this many times, I'm just excited and want to make sure I'm not missing anything. Thanks in advance.