So I have a predicament. I would like a reliable functional and well equipped AR-15. I think I would like to build my own however I've seen the Knight's Armament Sr 15 and I really like it. But because of its price I couldn't buy any Optics or a can, so I'm thinking that I might use Aero precision as a base to build my own high quality AR-15 I was wondering what you guys thought and what the best lowers and uppers are to try to get ambidextrous controls and all the features that come with the Knight's Armament I understand Knight's Armament has a different bolt carrier group but that's proprietary and I can't really do anything about that. really I just want to build the best most personalized AR-15 I can cheap enough so that I can still buy a good optic but I'm in love With A Knight's Armament Stoner rifle.