I'm going to invest in a ton of tools, but I go overboard with all of my hobbies. It's my best and worst trait as a human being (my wife would probably argue for worst

If you decide to go this direction, I suggest watching the following/reading:
http://www.midwayusa.com/general.mvc/in ... r-15-rifle (Videos are a great resource)
https://www.youtube.com/playlist?list=P ... BBD081C16F
https://www.brownells.com/.aspx/lid=11004/learn/
I'm probably going to get a 5.56 barrel because of budget on this one - it's going to be a plinkster and a 'cuz I can' gun, so I am not too terribly worried about 300yd accuracy. Maybe on the second build... I might get a Wylde if I can find a quality one at the right price. Mine is going to be a frankengun -- Aero Precision, DPMS, VLTOR, and Yankee Hill will probably all make it into it somehow. And MagPul.