Bullets for a Boy — J.R. Roberts

GUARDIAN WITH A GUN Clint Adams has never been what you'd call the fatherly type. But he has no choice when he finds a young boy named Billy wandering in the Colorado badlands, the only survivor of a bloody bandit attack that killed his family. Taking Billy under his six-gun, Adams aims to bring him to Denver, where there's a caring orphanage waiting for the boy--if he lives long enough to see it. Because the men who murdered Billy's parents know he survived, and they aren't about to leave any witnesses alive, no matter how small they are. But they're about to take on more than they can handle, because the Gunsmith isn't about to let them hurt little Billy--unless they're ready to die trying...