From what I can gather the shaw and faxon barrels are the only ones inside a 12 week wait that are 18" or over for the 6arc. Neither seem to be super well regarded.
After further research it appears .224 valkrie supplies and barrels are much more available, and this setup seems to provide a happy medium between a match .223 setup and a 6arc. I already have some .224 projectiles and potentially some powders that will work so that's a start
So with that being said I am heavily leaning to this RA ultramatch thats in stock and just ending this painful search
Rainier arms .224 Valkyrie barrels bring you the ideal configuration for precision and accuracy without the extra weight of barrel contour. Rainier Arms offers the great selection of .224 Valkyrie Barrels.
www.rainierarms.com