A No4 barrel in .308? I though it was just the Ishapores that were made in 308 (7.62 Nato)...
Do you have a No4 in .308 or are you working on some project to convert one?
$800 is steep, I wonder if the Criterion barrels will be any cheaper here in the US.
Most of the other barrels on their website are available for around $200 US...