sten? you mean bren?
cuz sten is kinda small for a mount but stens are cool because you can turn them into stormtrooper blasters
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Star wars blaster is actually modelled from a British Sterling 9mm

IIRC they used 9mm Browning Hi-Power Magazines in them for the films.
The Bren on the other hand was originally .303, but I learned it in it's 7.62 nato incarnation
Fearsomely accurate with a skilled team, and way better than the 5.56 L86 that replaced it

Either way don't remember them fitting STen or Bren to a Ferret. One's that I had any time in were fitted with .30 cal brownings and or 7.62 gpmg's