So… the Maxim PM M1910 on the roof (3rd picture).
Mounted:
- Gun: 23.80 kg (52.5#)
- Mount & Shield: 45.22 kg (100#)
- Total unloaded: 69.02 kg (152.5#)
Combat load:
- Water: 5 kg (11#)
- Belt 7.62×54mmR 250no @30g: 7.5 kg (16.5#)
- Total loaded: 81.52 kg (180#)
Quartermaster Section – PM M.1910 & M.1910/30 MACHINE GUN
Very heavy to lump up onto a roof, they'd probably need some dunnage/packing in the form of timber and sandbags.
Hopefully the wooden roof is going to hold the weight of the gun, dunnage, and operators.
Also – do these Maxims pull forward or push backwards during firing?