Yes. Ron is one of the premier mechanics of these things. He even was able to get the Chinese knockoffs to run properly. He always has enough gov't contract work to keep busy that he is able to be exclusive and choosy. But now that SCAR17Hs and M110s have been supplanting the M14s in the pipeline that kept him busy for so long, he might finally be slowing down.
I had him do his magic on a parts gun using one of his dual-lug receivers back in the 90s. It cost, and that hurt,...but it shot sooooooo very nice.