No Age have been known to cover Black Flag’s “Six Pack” in concert, but L.A.’s post-shoegaze punk duo got a chance to experience the real deal last night. Newestra reports that Chuck Dukowski and Keith Morris – both founding members of Black Flag – joined No Age on stage following their set at L.A.’s MacArthur Park. Under the banner No Flag, the quartet then went on to perform a six song set, barreling through cuts from 1978’s Nervous Breakdown EP, as well as “No Values” from 1980′s Jealous Again. Naturally, chaos ensued. We have your video evidence below.