The name of the model comes from the year the handgun was formally adopted by the U.S. army – 1911. As an official service weapon was replaced in 1985 but it is still one of the most used guns nowadays.
Many modifications on the 1911 were made by various manufacturers during the years but its basic function and operation remains in place over 100 years after its inception. Jacob O’Neal created amazing animated infographics how the 1911 .45 handgun works.
Source: http://animagraffs.com/how-a-handgun-works-1911-45/
Putting a round into the chamber
Pulling the trigger
Cartridge ejection
Safety
Ammonition & Magazine