Bren Gun
This World War II-era British training film, produced by Byron Pictures, Ltd., shows the importance of waiting for a target to move into the ideal range of a series of guns in order to have the best shot possible. The film covers the defensive and offensive firing of a Thompson submachine gun, a standard rifle (appears to be a Lee-Enfield rifle), a Bren light machine gun, the Boys Anti-Tank Rifle, and the anti-tank Ordnance QF 2-pounder by giving scenarios of incorrectly firing too soon followed by a scenario of correctly firing the various guns when the targets are in the most desired range to effectively shoot to kill.
Credit to : PeriscopeFilm