Here's a short story about guns and both good boys...
...and good boys gone bad from Dell's The Rifleman #3 (1960), but not starring Lucas McCain or his son, Mark!
This tale could've fit into any of the extensive volume of Western comics that filled the newsstands right before superheroes returned to dominate the comic book field in 1962.
It just happened to go in between stories in this title based on the Chuck Connors-starring tv series because of it's odd length, 4 pages. (Most short stories were at least 6 pages.)
Illustrated by the incredibly-versatile Alex Toth, at about the time he was transitioning from comic books into television animation.