I'm right around 1" 5 shot groups using my 77gr TMK handloads in a Feb 2022 purchased PRI Mk 12 Mod 0 1:7 twist upper.
I'm far from the best shooter when it comes to making tiny groups at 100yds, so all of this is to be taken with a truckload of salt, but I can easily say it is the most accurate AR15 I currently own.