I saw eight round clips broken-down to load 20 round BAR magazines with 16 rounds tooAttachment 66734Attachment 66735

photos shows a magazine loader - if you have cartridges on five round clips !

other photo shows the WW1 belt with metal cup for the BAR butt stock for advancing fire

The first use of a bipod used on the M1918A1 in 1937 and into WW2