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Donald, The 30DMG ships as a 9mm, however, by changing out the grip housing, bolt and barrel, other calibers can be fired using this modular system. Additional calibers in 5.7x28mm, 9mm, .40 S&W and .357 SIG kits will be available. I would contact Masterpiece Arms directly for the 5.7 conversion kit at -- https://masterpiecearms.com/contact-us/