Gun powder or air
Gunpowder, also compressed gasses and compressed air.
gunpowder
Black powder is a mixture, not an element. It consists of potassium nitrate, charcoal and sulfur in the ratio 75:15:10. It is used in fireworks and was once used to propel bullets in guns(still used with some antique guns).
That's what they were designed for.
Air is used to propel the plastic projectile
Old guns DID have bullets- that is the thing that is shot from the gun. They did not have cartridges, since they used loose gunpowder and bullets, and sparks created by flint on steel to ignite the powder.
Depends on the caliber.
yes they are. machine guns are fed bullets. Gatling guns are hand cranked and have to be fed bullets at the same time. machine guns also spray bullets faster than Gatling guns.
air and gun powder are the most common.
Yes, guns shoot bullets
Gun powder is used in some small fireworks and it is also used in bullets for guns.
There are bullets that are used in guns for hunting to shoot animals. There are bullet points that are used in writing to make it easy to find important information when reading a paper.