To swap a barrel $50 but there will be no guaranty the headspace is anywhere near correct, so your statement of no machine work as previously mentioned by Dan said is completely erroneous,
The problem with using a take off barrel is it was meant for one action not one model of action. So fitting and head spacing may line up perfect it also may not and it may require all kinds of additional work.
Personally with as inexpensive as a Shilen pre turned and threaded barrel is and they are long chambered too so really all you need is to face the shoulder a bit, there is no reason to pay someone to monkey with a factory barrel
