The rear delts usually get neglected, but this is a pretty easy fix and one you can do at home on a daily basis. The band pull-apart will bring your sad little finger-sized rear delts up to snuff quickly.
You don't need a heavy-duty resistance band because you're going to keep the reps high. Rock bottom rep range is 20, done for 4-5 sets daily.
James Chan is into machine gunning, shot guns, and cross wiring. If we didn't know better, we'd think he was one of those militia guys holed up in some shack in Montana, swearing never to be taken alive.