The T1x has an 11mm dovetail it is drill and tap but the hole spacing is different from the T3, also the action it's self is shorter. I don't think a T3 rail will fit.
How the scope can be mounted, be it with the dovetails or the D&T holes, does not relate to how the barreled action attaches to the stock.
I've highlighted the area of concern in the first quote, which is certainly relevant if correct.