Add in that whatever hand-fitting was done was sometimes undone when they were arsenalled. The way I've read that it was done was big bucket of bolts, big bucket of floorplates, big bucket of receivers, big bucket of stocks. You grab a receiver, you grab a bolt, you grab a floorplate, you grab a stock. You put bolt in receiver, you put receiver in stock, you put floorplate on the bottom. You then get Ye Olde Electric Pencil and you write the S/N from the receiver on the bolt and the floorplate, and you stamp that number on the stock and eradicate whatever numbers were on there from the factory. See? Now it matches.
Is rifle. Is shoots. What you want, handfitting? Pfft. Capitalists.