Sorry to sound like a nube here, I am looking to build my "first" AR and while I know the inner workings and such,and have a ton of experience using them, I have never done one completely from scratch! I have a very specific platform config I wish to build and this is where the questions and grey areas are I need to be aware of! I am wanting to build a "Retro ish" late 60's early 70's CAR rifle. I want it to look close but also want it as light as I can get! ! My understanding is barrel length needs to be 16 inch with out muzzle device installed, Correct? does that preclude having the short old school triangle hand guards? Also, any recommendations for light weight upper and lowers that retain a fixed carry handle, forward assist, and dust cover in place. I don't want any plastic and I don't want any thing carved out! Basically I want a XM-177/ CAR16 sort of look, at least as close as I can get! Any advice on the WYLDE chamber? Also advice on twist? Any other thoughts, recommendations, tips and tricks? Thanks in advance, Put me on the "Owes a few beers list"