McAdoo, a 6-foot-3, 285-pound junior defensive lineman from Chapel Hill (N.C.) High School, selected UNC over scholarship offers from East Carolina, Maryland, NC State, South Carolina, Virginia, and Wake Forest.
"I just basically felt at home at Carolina," McAdoo.
McAdoo unofficially visited UNC on Monday to watch the Tar Heels' first spring practice of the season.
"There was a lot of energy," McAdoo said. "It was very intense. Everybody just had fun. There was a good team camaraderie."
Following the practice, McAdoo returned to the UNC football office, where he decided to make his pledge. "I met with Coach [Butch] Davis and Coach Blake and I committed," McAdoo said.
McAdoo has attended junior days at Clemson, UNC, and NC State. He said he is finished with visiting other schools and his commitment is "very firm."
According to McAdoo, Blake plans to use McAdoo as a three-technique defensive tackle.
As a junior, McAdoo recorded 59 tackles including 20 for a loss and 13 sacks.