Black Valley Riders — Ralph Cotton

KEEP YOUR ENEMIES CLOSE--AND YOUR WINCHESTER CLOSER.
Seems like every time Arizona Ranger Sam Burrack rolls over a rock, a Black Valley Rider jumps out. Bred by the law of frontier survival, Sam knows when is outnumbered and outgunned. So when two U.S. Marines turned bounty hunters arrive in Minton Hill trailing the same outlaws he is, Sam agrees to ride with them. Trouble is, only a drunken gambler called Tinnis Lucas knows where the gang is holed up.

Now an unlikely posse of strangers must brave a desert full of Mexican banditos, Apaches, and rattlesnakes. And even if they survive, they're bound for Black Valley -- a valley of death if ever there was one.