As the title states just got off the phone with Ron and he informed me they are doing cut rifling, right now they are available in 6mm,6.5mm,7mm and 50 cal.they will also do gain twist, and the barrels are cryogenic treated and heat relieved. the best news is the price is not much difference between the cut rifled and their regular barrels.Hope this helps to spread the word , I am not affiliated with benchmark barrels just a satisfied customer if this is old news I apologise.