The first hand gun, or as they were called then Hand Cannon, or Hand Gonne was seen on the battle field in 1363 during Edward III's reign. They weren't favored due to their short range effectiveness, and the difficulty of firing them. They were also seen in England around 1375, and in Italy around 1397. For more details see the sites listed below.
1115 is when the first gun was invented
To kill and it was believed that it was a sort of protection
The oldest known air rifle gun was invented by Girandoni of Vienna about 1780, for the Austrian Army. Daisy is credited for invented the first BB gun around 1895.
The first was the gatling gun invented in 1862
1803
The black powered gun was first and it shot shotgun slugs but the pistol was the first gun ever invented
Germany invented the first assault rifle-the Sturmgewehr or STG
The first American gun that was invented, was the Colt firearm in 1836. It was invented by Samuel Colt (1814-1862) of Utah. This was a revolver, the first rifle was in 1879 by John Moses Browning.
Spencer
colt
Britain
George Shultz