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The difference in construction was driven by the difference in intended deployment. Selective fire rifles firing a full-power rifle cartridge from a closed bolt are called automatic rifles, while those of lighter weight and that are more easily carried are called assault rifles. Fully automatic firearms using pistol-caliber ammunition are called machine pistols or submachine guns largely on the basis of size. Other automatic weapons are subdivided into several categories based on the size of the bullet used, and whether the cartridge is fired from a positively locked closed bolt, or a non-positively locked open bolt. The majority of machine guns are belt-fed, although some light machine guns are fed from drum or box magazines, and some vehicle-mounted machine guns are hopper-fed. Medium and heavy machine guns are either mounted on a tripod or on a vehicle when carried on foot, the machine gun and associated equipment (tripod, ammunition, spare barrels) require additional crew members. Squad automatic weapons (SAWs) are a variation of light machine gun and only require one operator (sometimes with an assistant to carry ammunition). They also have either a barrel cooling system, or removable barrels which allow a hot barrel to be replaced.ДЄlthough subdivided into ' light', ' medium', ' heavy' or ' general purpose', even the lightest machine guns tend to be substantially larger and heavier than other automatic weapons. Because they become very hot, practically all machine guns fire from an open bolt, to permit air cooling from the breech between bursts.

Some machine guns have in practice maintained suppressive fire almost continuously for hours other automatic weapons overheat after less than a minute of use. Machine guns are normally used against unprotected or lightly-protected personnel, or to provide suppressive fire. Although the term 'machine gun' is often used by civilians to describe all fully automatic weapons, in military usage the term is restricted to relatively heavy weapons fired from some sort of support rather than hand-held, able to provide continuous or frequent bursts of automatic fire for as long as ammunition lasts. Unlike semi-automatic firearms, which require one trigger pull per bullet fired, a machine gun is designed to fire bullets as long as the trigger is held down and ammunition is fed into the weapon. Overview of modern automatic machine guns Often, the criterion for a machine gun as opposed to an automatic rifle is considered to be the presence of a quick change barrel or other cooling system (see below). By contrast to the other two categories (submachine guns and autocannons), machine guns (like rifles) tend to share a very high ratio of barrel length to caliber (a long barrel for a small caliber) indeed, a true machine gun is essentially a fully-automatic rifle, and the boundaries between the two are often blurred. Guns firing large-caliber explosive rounds are generally considered either autocannons or automatic grenade launchers ('grenade machine guns'). ДЄnother factor is whether the gun fires conventional rounds or explosive rounds. The distinction between submachine guns and machine guns is subtle, hinging upon whether the ammunition used is intended for use in side arms (chiefly semi-automatic pistols) or rifles the difference between machine guns and autocannons is based on caliber, with autocannons using calibers larger than 15 mm. Machine guns are generally categorized as submachine guns, machine guns, or autocannons. In United States law, 'machine gun' is a term of art for any fully-automatic firearm, and also for any component or part that will modify an existing firearm into a fully-automatic firearm.

The first machine guns were manually operated, for example, by turning a hand crank.

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:'For other uses of the phrase, see Machine Gun (disambiguation).'ДЄ machine gun is a fully-automatic mounted or portable firearm, usually designed to fire rifle cartridges in quick succession from an ammunition belt or large-capacity magazine, typically at a rate of several hundred rounds per minute.

MKLL MACHINE GUNS FOR SALE MANUAL

It was a multi- barreled rotary machine gun fired via a manual crank, which mechanically loaded and primed cartridges from the hopper above the gun] Thumb|200px|An_illustration_of_later_model_19th_century_ Gatling gun.

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