Yes, I've owned a copy for 15 years or so - very much the Sten bible. I also had the SAIS for the MkII and MkIII Sten, but not the one for the MII(s), MkV and MkVI. I'm planning to strip my MkV shortly, for which the SAIS will be invaluable.
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The Zib Militaria 'silencers' are just empty tubes for decorating deacts and I assume they're made in India or suchlike. I suppose in theory the end pieces could be recycled onto a correct length of 1.5" tube - depends how they're attached.