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Sten Chamber Reamers

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The British subguns of WWII and after had a specially designed chamber that would digest anything resembling a 9mm Para.  Does anyone know of a source for a reamer that matches those dimensions as opposed to the standard SAAMI/CIP dimensions?


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USGI TSMG's have slightly enlarged chambers for improved reliability just like the Lanchester & Sten so it seems logical that the enlarged chamber might be applicable to other 9mm SMGs as well.  Just curious as to whether this has been addressed

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