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I think they use Green Mountain blanks. Decent quality and I've heard they do good work. If you want a chrome lined chromolly barrel you can't go wrong. Not sure if they do stainless barrels.
Check their website and as ravohs said shoot them an email for info straight from the horses mouth.
I bought one a while back. They are dimpled for set screw gas blocks, however I don't know who's pattern they use. The one I had didn't line up for one of the screws.
almost all barrels on the market never lines up to the gas block you have. its like this gas block pattern that they used is some kind of unicorn poop!