Say: "God has a share in it and the devil has the exit’, and when you fire, say the following while crossing your left leg over your right: 'non tradas Dominum nostrum Jesum Christum. Mathon. Amen."
Grand Grimoire
This spell is notably similar to Grimorium Verum's "For Protection Against Firearms," which refers the reader to the Red Dragon (Grand Grimoire).
The grimoire The Grand Grimoire lists this spell.
This spell similar to the spell For protection against firearms