Different kinds of guns

There are a lot of different kinds of guns, also a because there are a lot of aspects where a gun can differ from another. For example, there are single action guns as there are double action guns. Single action weapons don't automatically recock. Which means that every time a bullet is shot the gun has to be manually recocked to fire the next bullet. Unlike double action weapons who recock automatically when the slide moves backwards.
Another major difference is the type of gun. Revolvers are guns which have a cylindrical bullet magazine, where pistols have a bullet magazine that stacks the bullets on top of each other.

The size of the bullet that the gun uses is called the difference in caliber. The caliber that the Colt 1911 uses is a 9mm. The 9mm stands for the diameter of the bullet.

And maybe the biggest differences in guns is found on the inside. There are a lot of different kinds of mechanisms inside a gun. Every mechanism can vary in guns.