Blaster Knuckle, much like RED, is a highly underrated manga with a lot of pure amazing things going on with it.
It immediately brings you into the action and also gets you up to speed fairly quick and the characters are all charming in their own rights.
Basically think if Guts from berserk was a black boxing bounty hunter fighting racism and the demon KKK with a special explosive fist.
Its as rad as it sounds.
It also does a great job of keeping the pace going with only a handful of slower moments that serve to make the experience better.
Similar to RED as well, it takes its time between or at the end of chapters to give little bits of history in the US (as well as some author insights)
I dont want to spoil anything but this is a very fun manga if you love just some good high fantasy in the west action.
My only real gripe with it is that it is too short. BUT a positive at least is it leaves it all open ended in a very good way.