I don't own one but I had control of three originals. They were one of these things that have gone into firearms folklore, like the Thompson gun - if there is such a thing! We tested a perfectly serviceable one with a rudimentary decibel meter against a Mk2S Sten gun and a Mk5 Sterling/L34 and........... Anyway, you didn't need to look at the meter readouts because the Sten was audibly quieter than the DeLisle