Barrels and hand guards aren’t something that will make a gun suddenly break. Springs are.

The military has beat Colt ARs to death for decades. That would also include mil FN built to the TDP but you cannot buy those. That isn’t to say guns can’t be made better (arguably HK 416) but none have gone through that vast proving ground for many decades.

That’s why, FOR THE MONEY, people say just get a Colt instead of anything else in that price range. It’s the easy button.