While they are very serviceable, they are very crudely machined in comparison to the FN commercial actions. The BEST indepth descriptions of the Mk X, as well as virtually all the other commerical mauser rifles and actions that I've seen is the book by Frank DeHaas " "The Bolt Action." If I wanted a rifle based on a commercial mauser action, the commercial FN action would be my only choice. DeHaas talks VERY highly of the FNs and based on my observations, I completely agree.
