Glad yours is working well, Peabody! Not trying to say you shouldn't have done it, why not if you know how to tune a rifle - just cautioning someone new from trying it. This is one of those things that can be a real can of worms for the inexperienced.
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