light machine gun|程式庫與試用程式線上App不用買

A light machine gun (LMG) is a machine gun designed to be employed by an individual soldier, with or without an assistant, as an infantry support weapon. Light machine guns are often used as squad automatic weapons.

Modern light machine guns often fire smaller-caliber cartridges than medium machine guns, and are usually lighter and more compact. However a light machine gun is defined by its usage as well as its specifications: some machine guns - notably general-purpose machine guns - may be deployed either as a light machine gun or a medium machine gun. Deployed with a bipod, and firing short bursts it is a light machine gun; if deployed on a tripod and used for sustained-fire it is a medium machine gun.

It is possible to fire a light machine gun from the hip or on the move as a form of suppressive fire intended to pin down the enemy. Marching fire is a specific tactic which relies on this capability. Otherwise, light machine guns are usually fired from a prone position using a bipod.

Many light machine guns (such as the Bren gun or the M1918 Browning Automatic Rifle) were magazine-fed. Others, such as the MG 34, could be fed either from a belt or a magazine. Modern light machine guns are designed to fire more rounds of a smaller caliber and as such tend to be belt-fed. Some LMGs, such as the Russian RPK, are modifications of existing assault rifle designs. Adaptations generally include a larger magazine, a heavier barrel to resist overheating, a more robust mechanism to support sustained fire and a bipod. Other modern light machine guns, such as the FN Minimi, are capable of firing from either an ammunition belt or a detachable box magazine. Lighter modern LMGs have enabled them to be issued down at the fireteam level and at two or three at the section/squad.

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