![]() Semi-automatic firearms are fairly common. A fully-automatic gun will continue to fire as long as the trigger is held. The difference is a semi-auto gun will fire only once for each pull of the trigger. Semi-automatics and automatics both automatically reload after firing. Other types of gas operation include long-stroke piston and short-stroke piston. ![]() After firing, the gases flow through a tube into a gas block, which then transfers the gas to a bolt key in order to cycle the action. A well-known example of this is the AR-15 model, which uses gas impingement. This mechanism is most often used for smaller calibers and is common for pistols, although variations such as delayed blowback can be used for more high-powered firearms.Ī gas operation mechanism uses a portion of the gases that the gun generates while firing to cycle a new cartridge into the chamber. The “blowback” sends the barrel back rapidly, which ejects the spent cartridge and loads a new one. The first is by using the force of the recoil. There are two main ways a gun can reload automatically. How Semi-Automatic Guns WorkĪ firearm is semi-automatic if a bullet automatically reloads and if the gun only fires once per trigger pull. Although this may be compared to automatic guns, they are two different types of mechanisms and work differently. The mechanism that is most common for modern firearms is semi-automatic. One factor to be aware of is the action mechanism, which is how the weapon reloads after firing. There are many different types of guns and each variety is different.
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