Colin Parkinson
Army.ca Myth
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9mm Luger was becoming the defacto calibre for Europe (there were several competing 9mm rounds and 7.62/65) The brits started with an disdain for the submachine gun, but were forced quickly to realize it's usefulness, at which point the only option to buy was the US Tommy gun in .45acp. The gun and ammunition was expensive. A couple of MP-18's were acquired and reversed engineered into the Lancaster SMG. It was simpler to adopt 9mm for the gun as you already know the required bolt weight and spring tension than to choose another calibre. Plus 9mm Luger lends itself well to Blowback actions. The Lancaster gun was not that cheap either and so the Sten was born.Related thought -
Why did the Brits make the Sten in 9mm. Because they figured there would be a lot of German ammunition available when they got to the continent. In the meantime it solved the problem of supplying the Resistance.