BSA-Király machine carbineIn 1938 a British arms importer, Mark Dineley, received blueprints

BSA-Király machine carbineIn 1938 a British arms importer, Mark Dineley, received blueprints for a submachine gun designed in Hungary by the prolific engineer Pál de Király. Dineley sent the blueprints to the War Office in Britain, who expressed some interest in the gun. An agreement was then reached between Király and Birmingham Small Arms, and borne out of this arrangement was the BSA-Király machine carbine.The BSA-Király was the precursor to the later Danuiva 39.M submachine gun that entered service with Hungary during World War II, and operated on a similar level-delayed blowback mechanism. It was chambered in 9x20mm Mauser and took magazines of 40 rounds. The trigger operation was remarkably complex and was controlled by a flywheel device, although Király proposed that this could be substituted for a simple sear if mass production went ahead.Despite performing well in tests, and being offered at a comparatively low cost of only £5 per unit, the BSA-Király was not taken into service with the British Army, as it was not widely felt that there was a requirement for such a weapon. This attitude changed when the British Expeditionary Force went to France in 1939 and demanded an immediate supply of submachine guns, by which time it was too late to adopt the BSA-Király. -- source link

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