Have not seen this happen on the front adjustment, but the mid (vertical) adjustment does occasionally fail in the heavier calibers.

The barrels are designed to bend, to allow them to be adjusted to achieve regulation. Within limits of course.

The joint needs to be resoldered. The mfg used silver solder (braze), I have some of the exact solder here as well as the correct flux they used. I would not recommend low tensile solder, there is a lot of stress on that joint due to barrel vibration.

If you are in TX I can help you, otherwise any competent local smith should be able to handle it (not much different than silver soldering on a sight ramp).

You don't have to reblue but there will be heat damage to the adjacent blueing as this is not low temp solder.

The regulation will need to be redone.