One Man's Law — J.R. Roberts

THE LAW OF LEAD
Clint Adams isn't altogether fond of anyone wearing a tin star -- lawmen have got too many rules keeping them from dispensing real justice. Still, when a local Texas marshal is gutshot while chasing the vicious rustler Chuck Brewer, Adams feels honor bound to comply when the lawman asks him to take on the badge.

But when he learns that Brewer's gone south of the border, the Gunsmith is going to forget he's a sheriff, and become judge, jury, and executioner...