The Lewis Gun utilized by British and American forces weighed 13 kg and could be carried by one soldier. The French Chauchat was even lighter at nine kg. Though a lot less highly effective than heavy machine guns, these weapons gave the infantry a crucial source of cellular automatic fire. https://machguns.com/product/lot-1452-u-s-auto-ordnance-1928a1-class-iii-nfa-cr-fully-transferable/