At the end of the Civil War, Jim Slade, a young confederate soldier and conscientious objector, returns to his ranch to find his parents murdered and the ranch practically destroyed. He finds and kills three of the murderers and learns the name of the fourth, a certain Corbett. Finally he discovers Corbett as the leader of a gang that has plans to rob a local bank and is invited to help defend the town from the bandits. Teaming with a preacher, who has an agenda of his own, the two take a stand against Corbett.
Unfortunately the movie A Gun for One Hundred Graves is not yet available on HBO Max.
| Directing | Umberto Lenzi | Director |
| Sound | Pietro Spadoni | Sound |
| Directing | Roberto Giandalia | Script Supervisor |
| Writing | Marco Leto | Screenplay |
| Costume & Make-Up | Vicente Vázquez | Makeup Artist |
| Camera | Francesco Narducci | Still Photographer |
| Editing | Daniele Alabiso | Editor |
| Directing | Francisco Ariza | First Assistant Director |
| Art | José Luis Galicia | Set Decoration |
| Writing | Umberto Lenzi | Screenplay |
| Costume & Make-Up | Maurizio Trani | Assistant Makeup Artist |
| Costume & Make-Up | Marisa Laganga | Hairstylist |
| Costume & Make-Up | Walter Patriarca | Costume Design |
| Camera | Miguel Guzmán | Still Photographer |
| Sound | Angelo Francesco Lavagnino | Original Music Composer |
| Production | Salvatore Alabiso | Producer |
| Writing | Eduardo Manzanos | Story |
| Production | Ignacio Gutiérrez | Production Secretary |
| Costume & Make-Up | Raul Ranieri | Makeup Artist |
| Camera | Raúl Pérez Cubero | Camera Operator |
| Art | Jaime Pérez Cubero | Set Decoration |
| Production | Fernando Rossi | Unit Manager |
| Art | Saverio D'Eugenio | Production Design |
| Camera | Alejandro Ulloa | Director of Photography |
| Production | Lamberto Andreani | Production Secretary |
| Camera | Renato Doria | Assistant Camera |
| Production | Averoe Stefani | Production Manager |
