Seemingly out of nowhere as they continue their barrage on internet, Migos team up with Rich The Kid to release the new mixtape Streets On Lock 4 with features from Young Dolph, Jose Guapo, Young Jeezy, Skippa Da Flippa, Rae Sremmurd, 2Chains and more. Production is handled by Murda Beats, Zaytoven, Dun Deal, Sonny Digital, StackBoy Twan & DJ Suede. Listen below!