I have ran thru a few cases of this ammo without issue.
I have 3 AR's one heavy barrel 20" set up with good glass and I have no problem shooting 1" moa with this 55 grain fmj, and that's thru a 1.9 twist, the other two are m4 variants with open sights and have no problem in these short guns
I have not bought any of there heavier grain bullets, but that is because I bought up a pretty good supply of the bronze when I could get it for 280 per 1000
in fact my high school senior grandson and three of his friends from high school are on spring break and are at the hunting camp on the farm, as I type.
the first thing they wanted to shoot yesterday were the AR's and they went thru at least 200 rounds yesterday afternoons, and will probably shoot the rest of the case that I opened yesterday, before they leave on wed.
reloadable brass at same price as steel Russian stuff cant be beat as far as range ammo.
its not been that long ago I saw a case of this sell for $1000 during the drought $1 per round