https://books.google.com/books?id=zX4VAQAAIAAJ&pg=PA3&dq=rifle+manufacture&hl=en&sa=X&ved=0ahUKEwj2v-SitbLYAhWILmMKHUmrAF8Q6AEIWTAJ#v=onepage&q=rifle%20manufacture&f=false
