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The JS is a Chinese select-fire bullpup submachine gun designed in 2005 by Jianshe Industry Group and built by China South Industries Group. It is the export version of the locally built QCW-05 chambered in the more common 9x19mm Parabellum pistol cartridge rather than the Chinese 5.8x21mm DCV05 round. It is also capable of using standard MP5 magazines.