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At the time, each Sten gun cost as little as £2 ($10) to produce – roughly equal to about $130...today...

DIY Stens

While tens of thousands of Stens were airdropped into Nazi-occupied Europe by the Allies, underground movements actually set up secret workshops to manufacture their own copies of the weapon. Danish, French and Norwegian partisans built hundreds of domestic duplicates, while the Polish engineered several improvised versions right under the Nazis’ noses.