That depends on what you mean by guns? The Chinese (who where the first to discover gunpowder) first used it to propell a projectile around about 1232. These were just very basic tubes similar to a modern rocket. Sometime in the 1400s matchlock guns were first used but the precussion cap wasn't invented until 1825. I belive the first automatic rifle was invented around 1903 by Winchester. It wasn't until 1944 that the Germans developed the worlds first assault rifle (the STG44 or MP44).
Bear in mind that most of the dates are approximates.
Guns where first invented in the late 1300's.It was very primitive, being only a steel pipe with a small hole where the gunner stuk a glowing hot stick ignighting the powder and the presure forcing the lead ball out of the barrel.
the first gun made was a 9mm hand gun.
Impossible to answer given the information supplied. Impossible to answer given the information supplied.
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