LMGs firing cartridges of the same caliber as the other riflemen of the same combat unit are often referred to as squad automatic weapons.Adaptations to the original rifle generally include a larger magazine, a heavier barrel to resist overheating, a more robust mechanism to support sustained fire and a bipod.Modern light machine guns are designed to fire smaller caliber rounds and, as such, tend to be belt-fed (from a container attached to the gun) or from a detachable high-capacity drum magazine, but some, such as the FN Minimi, will also accept standard rifle magazine feeding as an auxiliary measure when belted ammunition has been exhausted.In 1903, French military theorists noticed that the heavy machine guns of the day were of little use in infantry assaults.[1] The French quickly brought the prototypes to mass production to boost the firepower of advancing infantry.