In my 1918 manual is listed the content of the leather box.
Do you know of any PDF version of that 1918 manual that might be available online ?
what is the exact title i might google ?
I have a pdf version of a Sept. 1918 technical training handbook for the M1918 but it does not include photo plates like your picture shows.
In regards to the count of 42 BAR magazines, is there any reference in the manual to how that number was totaled up among the BAR team's belts and bandoleers ? or was the 42 mags supposed to be a rear area ordnance / quartermaster resupply ?
I get 42 if you include 6 for the gunner's belt (1 pocket containing the leather parts box)
6 for the loader's belt (if he's using a butt cup belt...and also 1 pocket has a leather box)
6 for the 2nd assistant's belt (again with 1 pocket being filled with something other than 2 mags)
24 mags divided among 4 bandoleers (2 left, 2 right) for the loader and 2nd asst.
I have seen references to the total load for a BAR team in WWI being 48 mags which wouldn't account for the gunner having a leather parts box in a mag pocket.... or 44 mags which means 2 of the 3 team members each have a pocket dedicated to something other than 2 mags.
it all kinda gets confusing with all the various online or print material.