Sorry, not enough info here for anyone to help much yet. I'd say have a nice talk with yourself and clear up in your mind exactly what you want and then let us know. Write a clear post explaining what you're trying to do and I bet you get a lot of help.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek