The Model 1873 was one of the most successful Winchester rifles of its day, with Winchester marketing it as "The Gun that Won the West". Still an icon in the modern day, it was manufactured between 1873 and 1923. It was originally chambered for the .44-40 cartridge, which was the first centrefire cartridge and which became immensely popular. The 1873 was later produced in .38-40 and .32-20, all of which later became popular handgun cartridges of the day, allowing users to carry just one type of ammunition. The Model 1873 was produced in four variations: a 24-inch barrel rifle, a 20-inch barrel carbine, and a "musket"—which was aimed at military contracts and only made up less than 5% of production.(Musket was a term that, at the time, denoted a full length military-style stock, not to be confused with a true smoothbore musket). The standard rifle-length version was most popular in the 19th century, although Winchester would make rifles to order in any configuration the customer wished, including longer barrels or baby carbines with barrels as short as 12 inches, octagonal-shaped barrels, colour case hardened receivers and fancy engraving.

https://en.wikipedia.org/wiki/....Winchester_rifle#Mod

This video was made with the help of the game World of Guns: Gun Disassembly:
http://store.steampowered.com/app/262410/