 In 2012, he played drums on Triggerman's Learning to Lie LP on 1124 Records.Other bands/projects in which O'Brien has played drums with over the years include Punk Rock Karaoke, Dragbeat, Front Row For The Meltdown featuring film composer Jeremy Little, The Generators, Second Chance, Miss Derringer and others.He and Mike Ness have long since settled their differences and though they are no longer bandmates, they remain friends.