Jason Kilkenny's gun

the long version

"Josh Kincaid was young; too young to be skipping school and day-dreaming about the outlaws and gunfighters he read about in the dime novels he hid from his parents and his town marshal uncle. Then, when he found injured bounty hunter Rance Savage and brought him into town, Josh found himself under the spell of a real life hero. But Savage was obsessed by an old grudge; filled with a bitter rancour against the man who had crippled him and left him to die. Nothing but full retribution would quell the bitterness he carried within him. Like the LeMat revolver he wore, the man was cold and deadly, an instrument of revenge. Before he realized what was happening, Josh would become the mankiller's unwitting accomplice in a scheme of vengeance that would tear the town apart and shatter his family."--Publishers description.