Mackey, 6-foot-6, 260-pounder, has already taken official visits to Arkansas and NC State.
"At NC State, my visit the second time was better than my first [official visit]," Mackey said. "My first time was good too, but my second was better. The atmosphere was great."
As a high school senior, Mackey officially visited NC State, as well as Florida State, UNC, and Virginia Tech, before signing a National Letter of Intent with the Hokies. After failing to qualify, he returned to Hargrave Military Academy and reopened his recruitment.
During his upcoming repeat UNC official visit, Mackey hopes to build on his knowledge of the school and program.
"I just want to look at different things," Mackey said. "I want to reevaluate my decision that I made the first time."
Mackey is looking to also eventually officially visit Virginia Tech. However, the Hokies berth in the ACC title game has made scheduling an official trip to Blacksburg difficult.
Mackey said he might not take his fifth allotted official trip. LSU, though, is the leading candidate for the final official, if one is taken.
Although he doesn't have a leader, Mackey considers Arkansas, UNC, NC State, and Virginia Tech his favorite schools.
"They're recruiting me the hardest, but also those are the schools I feel most comfortable with," Mackey said. "[They just have] comfortable atmospheres and I'm comfortable with coaches at all those schools."
Mackey says he is most comfortable with Browning, Butch Davis, and John Blake at UNC; Mike Reed and Keith Willis at NC State; Bryan Stinespring and Charley Wiles at Virginia Tech; and Tim Horton at Arkansas.
On Dec. 17, Mackey will leave Hargrave Military Academy. He then plans to enroll at the school of his choice in January.
Last fall, Mackey played on Hargrave's defensive line opposite of Quinton Coples. Coples has since moved on to UNC, but remains in regular contact with Mackey.
"He says he has had a good experience," Mackey said, adding that he has taken notice of the amount of playing time Coples have received as a true freshman.. "He's learning a lot from the coaches and really gets along with all the coaches.
"Really, he doesn't push me towards UNC. He just told me to make the decision that's best for me."