GM barrels are very accurate - that price is super. I can well see the drive to have them make up a bunch!
I have a GM 18" .45 barrel that thinks it's a BR barrel.

Pac-Nor barrels are very accurate as well - super accurate and super clean shooting. The last one I bought - number of years ago now, was over $300.00 landed here.

$120.00 is incredible if contoured blank, but still great if full sized blank.