I believe that they WERE Sten slings, but at some point have been shortened. One give-away is the lack of any manufacture's stamp or date which was on the piece which has been chopped off. I am hopeful that I will stumble upon an Ordnance Instruction to shorten Sten slings for some other purpose.
Of course the Vocabulary of Ordnance Stores could also reveal if there was more than one Mark or Pattern of Sten Sling.
ED
