A lot depends on the gun and the sight. I have never been much of a fan of the standard AR sights but I am a big fan of peep sights.
With my stock AR I have a hard time holding 4 inches at 100 but with the AR in the photo it’s easy to hold under 2. But the gun also fits me much better.
I have 4 other guns with peeps, one of those on a Winchester 75 I paid more for the sighs than the last AR I put together. With it I can hold a nickel at 100.
Note: all of this is with 223 Hand loads. “Inexpensive 223” easily double the grouping.
Understand this is across sand bags, I’m too old for anything other than prone without the support of a gun rest or bags.
"The difference between stupidity and genius is that genius has its limits" Albert Einstine