40 Cal

Calvin Alan Byrd  (born December 17, 1981), professionally known by his stage name  40 Cal , is an American  rapper .  He was 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 . He took a part on  MTV2 's Fight Klub MC battles