The correct option is "machine guns"
The idea of a firearm that triggered repetitively has its roots in the first generation of mature firearms, at the beginning of the 16th century. However, it will be necessary to wait until the metallurgy improves so that the first models of repetitive fire with the French Mitrailleuse arose, support arms built from the superposition of rifle barrels that were loaded by the chamber and that could be fired in succession, sowing of shrapnel (mitraille) the arc of fire of the weapon. Its use in combat in the Franco-Prussian war did not give conclusive results, especially compared to the Prussian firearm artillery pieces, entirely forged in steel and of a clearly superior effect.
In 1884, the first authentic machine gun appeared, the Maxim invented by the British nationalized American Hiram Maxim, who used the exhaust pressure of the firing gases to cause the recoil of the barrel, the opening of the bolt, the expulsion of the cap and the feeding with Another new cartridge obtained from a tape on the side of the weapon.
Maxim held demonstrations throughout Europe and his machine gun was adopted by most of the continent's armies. In 1885, the designer, inventor and manufacturer John Browning presents in the United States a model of machine gun powered by gas that is collected from the barrel through a piston inside a tube connected to the barrel of the weapon, a system adopted later for rifles Semi-automatic and assault.