Re: Does anyone make a good accurate ar upper in .223?
I get about an inch or just over with a 1/7 14.5" LMT at 100m, but that is using 75gr. T1 handloads. ACOG, barrel isn't FF and it has a bunch of shit hanging off it. With the M855, it was all over the place, like a 4" group at best (and this lot shot fairly okay in a different rifle). The SDN6 suppressor does seem to open up the groups a bit no matter what I'm shooting; how bad depends on a few factors it seems with how tight the suppressor locks up being one of them.
For a good out of the box quality 5.56mm upper, the LaRue Stealth upper looks like a good one and I think it is about $1k. I think they have an accuracy guarantee too.
My best rifle is in 6.5G, I built it using a Satern barrel and it gets .33" groups. Haven't shot it with the suppressor yet, need a new scope. I suspect the Satern 5.56mm barrels would perform just as well. Mine came matched with the bolt. They don't build uppers and as far as I know nobody "makes" one, but you could easily have one assembled. Ordering a custom barrel direct from them can take from a long time to never, depending. Midway carries them I think.
Krieger and another come to mind as being good barrel makers for AR's, and when it comes to AR's, it really is the barrel that makes for most of the accuracy.