The Lewis Gun employed by British and American forces weighed thirteen kg and could be carried by just one soldier. The French Chauchat was even lighter at 9 kg. Whilst a lot less powerful than heavy machine guns, these weapons gave the infantry a crucial source of cellular automatic hearth. https://machguns.com/product/lot-1452-u-s-auto-ordnance-1928a1-class-iii-nfa-cr-fully-transferable/