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What uppers (and other parts such as stocks, barrels) are compatible with the Carbon-15 9mm rifle lower?

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Only the 9mm upper can be installed on the 9mm lower receiver. The 9mm lower receiver magazine well is restricted in the bottom so that it will only accept 9mm magazines. A .223 magazine will not fit into the 9mm lower receiver. Any AR15 type buttstock or pistol grip can be installed.

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