I've built several of my own rifles, enjoy shooting and experimenting with other kinds of firearms, and have handled nearly every type of gun found in the last 500 years.In order to understand guns better, we put together this guide to guns, where we look at the weapon as a tool and investigate its history as well as the different types of guns.


How Guns Work

A gun works as follows: A bullet is loaded into a tube connected to the firing pin at the end of the barrel.When the trigger is released, the firing pin flies forward, striking a tiny explosive charge in the base of the bullet. This sets off a chain of events.Exploding gunpowder, tucked around the bullet in the shell casing, ignites it.Bullets force their way out of the casing and down toward the target due to pressure change.


Calibers & Bullet Types

Any discussion of guns, whether on the news or elsewhere, will mention "caliber.".The term refers to the type of cartridge that is fired by the weapon.

The caliber of a bullet can be determined by fractions of an inch or by millimeters.A .45 ACP round with a diameter of 0.45 inches is just under half an inch wide and is used in many handguns.The .22 round, .38 Special, and .500 Action Express rounds are all named after their diameters as fractions of an inch.The 5.56-millimeter round used in the AR-15 (also known as .223) has a diameter of 5.56 millimeters.A 9-millimeter round has a diameter of 9 millimeters.As well as that.

.357 Magnum revolver bullets cannot fit in a Glock pistol chambered in .357 SIG.In addition to pistols, the .22 Long round is primarily intended for rifles.In general, a single gun can only shoot one type of bullet, but that was not always the case.