This question is hard to answer because it needs to be more specific. Are you asking how many operating types of handguns? Such as revolvers, semi automatic, single shot, muzzle loader, etc? Or are you asking how many models, of all guns, of all companies ever? Or another type of question altogether?
Long guns, hand guns, artillery
There are only two types of firearms. Long guns and hand guns.
There are only two types, long guns and hand guns.
Guns come in many different varieties; among them are pistols, rifles, handguns, and shotguns.
Two: Hand guns and Long guns
Hand weapons and crew served.
Thousands
There are many different types of guns! Shot guns, rifles, hand guns, pistols, even paint guns and air soft guns. Then with each type there are different callibers, which is the size of the bullet that is shot through it. the higher the number the bigger the calliber therefore the bigger the bullet and generally the bigger the gun.
A howitzer, of which there are many different types.
There is only one "type", however, there are many different models.
how many types of guns are there in the world?
There were approximatley 120 different types of guns in the civil war. There were many varieties of muskets, repeaters, pistols, ect. Many of these weapons were similar varieties of the same model of weapons. For example the union had muskets as well as the confederacy but they were different varieties.