FIG. 1 is a perspective view of a trigger cartridge showing my new design;
FIG. 2 is a top plan view thereof; the broken lines in FIG. 2 are included for the purpose of illustrating a portion of the trigger cartridge that form no part of the claimed design;
FIG. 3 is a back elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a front elevational view thereof; the broken lines in FIG. 5 are included for the purpose of illustrating a portion of the trigger cartridge that form no part of the claimed design;
FIG. 6 is a left side elevational view thereof; and,
FIG. 7 is a bottom plan view thereof; the broken lines in FIG. 7 are included for the purpose of illustrating a portion of the trigger cartridge that form no part of the claimed design.