I ordered 2 of their barrels from their previous website configuration options back in Sept when they were 50% off, straight contour (no taper, 'truck axle'), it was their only contour available then. I ordered the Savage/Zermatt threads, these came with a barrel nut but it seems to be a special/custom design nut where the front part of it passes over the widest part of the barrel and stops on an internal shoulder. A standard savage barrel nut or other aftermarket savage nut (I checked both) is not large enough diameter to spin past the widest part of the barrel. I have not screwed these on an action yet to see fit or shoot these yet, but 1) these came with a nut and 2)the nut looks specific/required for this large diameter contour barrel. I'm not sure if the new contours or configs include the nut but assume so. Other than email updates on my orders, I tried contacting support for questions and got no responses other than them emailing to say their website contact form was down. Other research I did before buying seems to be they are not really responsive to questions and maybe only to quality issues.
Sent from my SM-F916U using Tapatalk