It all boils down to COST.
OP, obviously cost isn't important to you or you wouldn't devalue that Ranger issue rifle, which has substantial value as is and would lose value if you rebarrel it.
As mentioned by tiriaq, it may be difficult to find a smith with the proper tooling to do the job.
No1 and No4 receivers don't have a lot of areas to fit a wrench on and are quite soft in comparison to other types.
Very easy to make a mistake and mar or crush the edges.
It requires a special base for the bottom of an outside wrench over the breeching area, with a cut out for the king screw pedestal, and an upper with a half round cut out, with just enough clearance for a brass shim, so the two pieces can be clamped together equally on both sides, so you don't deform the receiver ring area when applying torque to the wrench.
I have seen barrels that twist like pretzels when being held in a barrel vise while taking them off the receivers.
If that rifle shoots well, leave it alone, would be good advice IMHO. If it was done by an armorer, it's "correct" as issued and IMHO doesn't cause much, if any, loss in value.