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Pretty sure the op is trying to make a sten mk 5. Issued to commonwealth airborne on day and market garden. It is a sten mk 2 with some changes ( wood butt stock, wook pistol grip, rounded trigger guard and a lee enfield foresight )

Original stens ( first one hundred thousand or so) were made with wood stocks and conical flash hiders. One of the reasons the sten went into mass production was that they could be made quicker and cheapet than rifles and even quicker and cheaper with no wood or flash hiders. The mk 5 is the 1944 model; made when england was not as desperate as they were in 1940.

Edit: you have to remember this is airborne in its infancy. The wood sten was probably a pound and a half heavier than earlier models such as the mk 2. The us airborne went in with thompsons and garands which are both heavier. 3 years earlier axis airborne riflemen were dropping with pistols. Their rifles came down in cargo containers.