<Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2018) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2018) (Learn how and when to remove this template message) </Td> </Tr> <P> Formerly, rifles only fired a single projectile with each squeeze of the trigger . Modern rifles are capable of firing more than one round per trigger squeeze; some fire in a fully automatic mode and others are limited to fixed bursts of two, three, or more rounds per squeeze . Thus, modern automatic rifles overlap to some extent in design and function with machine guns . In fact, many light machine guns (such as the Russian RPK) are adaptations of existing automatic rifle designs . A military's light machine guns are typically chambered for the same caliber ammunition as its service rifles . Generally, the difference between an automatic rifle and a machine gun comes down to weight, cooling system, and ammunition feed system . Rifles, with their relatively lighter components (which overheat quickly) and smaller capacity magazines, are incapable of sustained automatic fire in the way that machine guns are; they trade this capability in favor of increased mobility . Modern military rifles are fed by magazines, while machine guns are generally belt - fed . Many machine guns allow the operator to quickly exchange barrels in order to prevent overheating, whereas rifles generally do not . Most machine guns fire from an open bolt in order to reduce the danger of "cook - off", while almost all rifles fire from a closed bolt for accuracy . Machine guns are often crewed by more than one soldier; the rifle is an individual weapon . </P> <P> The term "rifle" is sometimes used to describe larger rifled crew - served weapons firing explosive shells, for example, recoilless rifles and naval rifles . </P>

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