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Don't know of any Mk.1 Stens around - that was the one with the weird flash suppressor.
The Mk.II is the more common type, and is available in real, de-activated form (expensive !), replica, like mine, around £195 to £250, or at least two airsoft makes, around £150 ish.
Man, a deactivated one would be AWESOME.
Why deactivated? What fun is that?Now, if one can find a de-activated Vulcan!
You plan on shooting a bank? That's bad, you can't do that.Otherwise you would need a chain of activated banks, just to be able to taxi to the runway threshold !!