LOS ANGELES – A.J. McKee is officially a lightweight for the first time in his career. McKee (18-1 MMA, 18-1 BMMA), a former Bellator featherweight champion, will move up a division on Saturday when he meets Spike Carlyle (14-3 MMA, 1-0 BMMA) – who missed weight – in the Bellator 286 co-main event at Long Beach Arena in Long Beach, Calif. It’s one of the key bouts on the main card airs that on Showtime following prelims on MMA Junkie. Watch the video above to see both co-headliners weigh in ahead of Bellator 286, as well as the rest of…