As a sentence it does not make sense. As description of a scene it doesn't seem to make sense either. These title are often very evocative. Could the description actually be: THE PISTOL: ROLLED GUNBELT ON THE SURFACE.
I guessed it was a film script. I suggest that my original reorganisation is actually what the title is describing. There is a pistol AND a rolled gunbelt on the/a surface. So perhaps: LA PISTOLA. UN CINTURON PISTOLERO ENROLLADO . . . More or less as you suggested. It is the only way I see to make sense of the scene description