A phone call to Lilja for a barrel, a gunsmith, components, maybe $1000 +
/-.
Don't know squat about the .22 CM, but I'd bet PacNor would do a bang up job for significantly less
And I don't know if Lilja does barrel installation, but if he does, I'd guess he'd come in lower as well.
Unless I had a third party 'smith I really trusted, I'd avoid that step of the process.