MusicRadar has an interview with John Feldmann about producing Blink-182’s California that contains quite a bit of information I hadn’t heard before:
To me, the essential Blink sounds are the band’s instruments. Travis has a total custom kit that’s been built from scratch using some vintage parts and some modern parts that him and his tech Daniel built from the ground up. Besides being the best drummer that’s ever lived, his passion for the instrument is key to his sound.
“All of Mark’s basses are custom-built Fender’s made to his specifications. Jerry Finn actually suggested re-routing Mark’s pickups to flip them because of the way Mark plays – he has this really interesting downstroke.