OP, I guess you missed this the first time. Again, check and see if the YHM gas block folding sight will clamp down over your gas block. If so, it might be the best front sight option. Or see what the maker recommends.
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