Blaster Knuckle had potential, but it's way too short.
The whole story is basically "black guy on the run from the law is fighting demon-monster things. He gets hunted by a great gunman who it turns out is his childhood friend. Together they kill the demons. The end."
I wasn't expecting a Berserk-quality serious seinen, but I was hoping it'd have a little more meat to it than what basically amounts to "Army of Darkness but with a black dude."