Barrel blank needed for subsonic 22 RF

[ohnomrbillk]

I see Volquartsen, EABCO, HiDesert Dog offering 1 in 9 twist barrels for 10/22 to optimize the use of the Aguila 22 SSS 60gr rounds. I had heard Green Mountain made the non Volquartsen blanks, but I don't see it on there site.

I'm looking for a barrel blank for a (not Ruger) 22 bolt gun as a very quiet project. Input on sourcing a barrel blank anyone has luck with in this chambering greatly appreciated.