Hello,
I am working on a new build.! Nothing fancy. Just a standard 16", flat top, 5.56 black rifle. Well I thought I was done but after torquing the barrel but on and slipping on the free float hand guard I noticed the is not centered. I have taken back apart. Made sure alal the surfaces are clean but its off kilter. Is there a quick way to find out if I need a new upper or a new barrel?

Thanks