God's Gun, also known as Diamante Lobo, is a 1976 Italian-Israeli Spaghetti Western cowritten and directed by Gianfranco Parolini (credited as Frank Kramer) and starring Lee Van Cleef, Jack Palance, Leif Garrett, Richard Boone and Sybil Danning.

Leif Garrett plays the main character in the film as Johnny, a fatherless kid who brings the reformed gunfighter to town to avenge his brother's murder.

[4] One day Sam Clayton (Jack Palance) and his gang arrive in the small town of Juno City, where Father John (Lee Van Cleef) is the priest of the local church.

Vowing revenge, the gang ambushes and guns Father John down on the steps of his church, and then the outlaws take over the town while waiting for the arrival of the next stagecoach with money.

However, Johnny O'Hara (Leif Garrett), a local boy, manages to escape town with a couple of their horses and rides off to Mexico in the hope of finding the priest's gunfighter twin brother Lewis (also Van Cleef).