I'll ask the obvious question - why didn't you just buy a B22 FV-SR?
No aftermarket barrels for the rimfires that I'm aware of, at least not anything in the form of a pre-fit. Savage won't sell you a barrel unless they install it, and given the rimfires are made in Canada it's a logistical nightmare. They'd also probably charge you about the same as it would cost you to just go buy a new B22 FV-SR.
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