My ex Fin gun has the Mk5 handle and no sling loop on the barrel nut either. There isn't a hard and fast way to tell other than the Fins put a bit of money into refinishing STENS and tend to appear better finished than when they left the UKfactories. What happened to them since they left Fin refurb may result it an old looking gun but the linished welds and new serial number remains.
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