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In the book "Ruger and His Guns" there is a picture of a jig that the factory uses to check how straight the Model 77 actions are after they are cast. The book says that most have some degree of warp to them and a technician "massages" the action with a hammer until it is within the given tolerances. I assume some are better at giving these massages than others............

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I very much doubt that BRNO/CZ are cast as, to my knowledge, Bill Ruger was the first major firearms manufacturer to us Investment Casting for his main rifles. Others may have made some prior to Ruger but were not major players in the field. Not talking hand guns just rifles.