Volley gun
The Ribauldequin was a medieval version of the volley gun. It had its barrels set up in parallel. This early version was first employed during the Hundred Years' War by the army of Edward III of England, in 1339. Later on, the late Swiss army employed it.
BB gun
In 1886, the Markham Air Rifle Company in Plymouth, Michigan produced the first wooden-construct spring-piston air rifle design as a youth training gun, and used the BB-size birdshot as the chosen ammunition. Two years later, the neighbouring Plymouth Air Rifle Company (later renamed Daisy Manufacturing Company in 1895) introduced the first full-metal airgun that also shot BB shots — the Daisy BB Gun, which became very popular household name due to successful marketing. Around 1900, Daisy changed their BB-size bore diameter to , and began to market precision-made lead shot specifically for their BB guns. They called these "round shots", but the "BB" name was already well established, and most users continued calling their guns "BB guns", and the projectiles as "BB shots" or just "BBs".