Ive only worked with factory finished 77 and round blanks and they were as serviceable as a factory barrel. Ill preface it with my experience being 15 -20 years ago, company quality can change a lot in that time. I've been packing around a 77/17 barrel for some time to use as a blank, was thinking it might be worth measuring to see if it could be used as a donor. Might be cheaper to find a good 77 barrel then blank.