The latest single off Mike Will Made It's upcoming Est. In 1989 Pt. 2.5, due out December 24, finds Chief Keef collaborating with one of the ATL's hottest on the rise, Young Scooter. Finally Rich is in stores tomorrow, while Scooter's Street Lottery tape drops January 1. 

Listen: Chief Keef f/ Young Scooter "On It"

[via The Fader]