I suspect that with modern machine tools pretty much every manufacturer can make barrels etc to such a high standard that they are capable of moa. It's the other bits where costs are cut that let them down.
I've seen several of remingtons flagship for its voyage to the depths the model 770 turn in sub moa groups. They may have taken some time to shoot what with the dismal extract and ejected setup, the fiddly to feed from magazine and interesting trigger but they could do it repeatedly.
How they fared as they got older I have no idea but you don't see them up for resale so perhaps they must be loved.
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