Some folks have done Axis builds with a standard 10/110 barrel nut, but it requires that notched section at the front of the receiver that Rosco mentioned to be turned down. Then the Axis lug is removed from the stock, and the standard lug will fit in the same place once the barreled action is put in place! Sharpshootersupply offers this service.

None of my Axis projects have had that treatment, though. There may well be some advantages to using the regular, barrel mounted lug, but they have not been made manifest at my level of shooting.