World War II Sten gun manufacturing in England

A woman rolls a loaded wheelbarrow to another woman who hands guns to a uniformed man on a truck with hundreds more firearms / CU the man placing a gun onto a rack / pan racks with hundreds of the gun muzzles // A woman inside a factory operating a lubricated lathe on a cylinder component; another at a hydraulic press removing probably the barrel of a gun / A line of women wearing welder's goggles working on the guns / One woman with an oversized square welders' mask works / her workspace / Women seated at a long table; one hammers a pin into a gun body held in a vise / Women looking over and stacking guns / Women rub bluing on the guns and one checks the spring-loaded ammunition mechanism / Note: exact month/day not known