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What is possible for this submachine gun?

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Another question regarding my stealth-action game, you see my favorite submachine gun is the PP-19 Bizon, but I'm not exactly what you'd call knowledgeable of weapons. Is it in the realms of the reality for a PP-19 Bizon to be customized? Like using 5.7 x 28mm rounds in its magazine instead of 9mm, but keeping the same amount of 64 rounds? As well as having a dot sight and a laser sight?