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Calvin Alan Byrd is an American rapper better known as 40 Cal. He is a member of Harlem based Hip-Hop group The Diplomats. 40 Cal made his first appearance on the self titled theme song, "40 Cal" for the Dipset album Diplomatic Immunity 2. However, his reputation is built on his notable rhyme battling skills, which was captured best on MTV2's Fight Klub MC battles....


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