3 Firearm Modes of Operation (& How They're Powered)

It's very common for those unfamiliar with guns to misunderstand how their operating systems work.

by
posted on October 4, 2023
Pump Gun

It's very common for those unfamiliar with guns to misunderstand how their operating systems work. The simple version is this: There are three basic "modes of operation" for guns, and three basic ways to power that mode of operation. Today we'll explore both.

Modes of Operation

Manual (Single-shot)

After a single shot has been fired, the mechanism of the firearm must be manually cycled by the shooter to unlock, extract, eject, feed, chamber and fire a subsequent cartridge. 

Semi-Automatic

After manually loading the first round, this method of operation uses recoil or gas from the fired cartridge to power the action cycle. A single shot will be fired each time the trigger is pulled until the magazine is empty.

Full Automatic 

A fully automatic firearm will fire repeatedly with a single pull of the trigger until the trigger is released or the magazine is empty unless the gun is equipped with what's known as a "burst-limiting" device. (Firearms of this type are classified as Class 3 Firearms, and civilians cannot own them without permission from the ATF and paying a $200 federal tax stamp.)

Powering an Operating System


Manual Power:
Exactly what it sounds like! Human muscle performs the cycle of operation, as in with single-shot firearms and pump- and lever-action firearms.

Self-Loading: The forces generated by firing the cartridge are harnessed to perform the cycle of operation. 

Externally Powered: An outside mechanical power source is used to perform the cycle of operation, as in with some large military full-autos. Examples would include the Gatling gun.

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