There are no real "gunsmith" lathes made, that is nothing more than marketing hype. There are no manufacturers of lathes that actually "gunsmithed" for a living to know exactly what the optimum machine would entail, and how every operator has differing opinions.
I have been a full time gunsmith for the last 25 years, and I can tell you that there is no single lathe to fit the entire bill. That's why I have 3 lathes, and every one of them has been modified to a certain extent to accommodate a particular purpose.