I completely understand that which is why many companies charge far less, they know people don’t want to spend that,I have an Armory on over 50 MK18, CQB commandos, M4s which I am responsible for maintaining. All built specifically to TDP. Not commercial “Mil-Spec.” I have yet to find or receive one that is not sub 1”. Several of those guns are 15+ years old and have over 40k they them and will still hold under 2”.
So, what do us civies do? Buy only Colt?
I don't think so.
For us unlucky home builders, Squaring receivers to get sub 1" is a fact of life.
$250+ just for a stripped upper isn't in my budget for one, much less several ARs.
Most of mine don't even LOOK like a Colt upper
But, they are 7075.