Welcome to the forum.
I think the SFAR does have 4 settings. 0, 1, 2, and 3.
You should shoot it before asking Ruger to send you a new regulator.
I understand that, Ruger updated the regulator, so it would just be nice to have both options available to me.
And it just seems like it would be a good idea to have a regulator with more settings. The aftermarket adjustable gas blocks I've looked at some have 15 different settings.
More settings in sizes between the stock 2 and 3 would likely be beneficial.
Say there was a second regulator that had settings of 2.25, 2.5, 2.75, 2.85
four additional settings for fine tuning. Obviously those number only reference the numbers stamped on the regulator. Idk what the actual hole sizes are but you get the idea.
.