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I was told-over 40 years ago, when I was in the Army-that Hollywood propmen and armorers had various tricks to make semiautomatic firearms work without using blank adaptors. One version was they used sleeved barrels
that allowed the blank to generate enough pressure to operate the action. Which also made use of ball ammunition in such modified firearms impossible.Just reporting, I have never actually seen one. Merely changing a spring will do nothing.
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