Wm. B. Harrison, The gunsmith's manual (1883)
“ In earlier days the devotees to his calling may, in their little shops, have made guns entire, but now, if the gunsmith makes them at all, that making consists in merely finishing up the parts and putting them together—generally making the stock entire. All gun parts can now be bought as “gunsmith’s materials,” either finished or in the rough, as may be desired. They are made by a variety of workmen, the business of each man being to make a single part, and nothing more. There is at present too much in a good gun to admit of all being made advantageously by one man ”
