When did Savage change barrel nut notches from radius to square?

[MSR_Gal]

Approximately when did Savage change to the current square notches in the barrel nut from the older style radius knotches?

[sharpshooter]

1997

[strut64]

The wheeler wrench has both styles incorpeorated in. One end square and the other round. soo, it really is OK either way.