Not sure if this has been posted before but I just found this and thought it was really interesting.
British 1918 Farquhar-Hill rifle at the range. This rifle was an early semiauto design that was accepted by the British army too late to see service in World War I, but was used as an observer's weapon in two-seater British aircraft. It is chambered for .303 British caliber, and feeds from a 19-round drum magazine.