I have built dozens of rifles over the years for friends using Model 1 parts kits. I have never been disappointed with the quality of there parts. They are also great to deal with over the phone. Good company, good people.
I have a Model 1 sales 300-221 upper that I bought several years. It seems like it could be a little more accurate, but I have never had any problems with function.
(Other than tuning powder to cycle both subsonic and supersonic)