So they want 350 to fit a fluted barrel and throat to your dummy?
I charge $200 to fit a barrel. If it's fluted I time them and if They send a dummy I throat for it. Might add 20 -30 minutes to the job. I still charge $200.
May-be I should be charging for it.
$150 in shipping and ins. could cover shipping your parts to PA, WI, ND, or MT where the smiths stand behind there work.