I have a GA Precision GAP-10. It will very consistently group 5 shots into .5-.7 moa. I have multiple pics of .5 groups.
The barrel is the heart and soul, the engine if you will, but the shooter is the bigger variable. Just because a Porsche can go 180 mph, doesn’t mean every driver can take advantage of that performance.
There are more moving parts to a gasser. Tiny mistakes that a bolt gun will forgive, a semi-auto will not. Position and follow through are very important with gassers.
There are truly AR-10’s that can shoot neck and neck with bolt guns, if the shooter knows how to drive it.