This is starting to sound complicated, but what you really need to know is that, generally, a single gun can only shoot a single kind of bullet.ĭifferent types of bullet calibers are meant to accomplish different tasks, and there are literally hundreds of bullet calibers. 22 Short round is primarily meant for pistols, while the. 357 Magnum revolver bullet will not fit in a Glock pistol chambered in. That said, a bullet’s diameter does not mean it will fit in every gun of that size, and there are many sub-varieties of ammunition. The nine-millimeter round is nine millimeters in diameter. The 5.56-millimeter round used in an AR-15 (also expressed, in inches, as. 500 Action Express rounds are all named for their sizes as a fraction of an inch. 45 ACP round used in many handguns is 0.45 inches in diameter-just under half an inch wide. This term is merely a way to identify the type of cartridge that the weapons fires.īullet calibers are identified two ways: by fractions of an inch or in millimeters. You’ll hear “caliber” tossed around in any discussion of guns, on the news or otherwise. It’s true that many guns operate quite simply, but as technology progresses, newer models are continually becoming more sophisticated. Some guns have lights, lasers, rifle scopes, bipods, and other accessories to identify a target or aid in marksmanship. Today’s firearms have magazines capable of holding up to 30 or more bullets, or more than one barrel, or can fire more than one bullet per pull of the trigger. The pressure change forces the bullet out of the casing and down the barrel toward the target.Īdmittedly, the rapid evolution of guns makes it hard to look at them and see their basic components-a trigger, firing pin, and tubes. That explosion ignites the gunpowder, which is tucked inside the shell casing surrounding the bullet. Mechanically speaking, the trigger is the catalyst that sets a chain of events off starting with the release of the firing pin which flies forward, striking a tiny explosive charge located in the base of the bullet. In the most basic sense, guns work like this: A bullet is loaded into the rear of the barrel, which is a tube connected to the firing pin.
This is a broad definition that covers everything from potato guns to fully automatic machine guns, but it provides the basic definition of what a gun is and how it works. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) defines a firearm as, “Any weapon (including a starter gun) which will or is designed to or may readily be converted to expel a projectile by the action of an explosive.” In other words: If you have a tube and a projectile, and the projectile is designed to fly out of the tube as the result of an explosion, you have a firearm.
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