The ornamental design for a magnetic levelgauge for ammunition in firearms, as shown and described.
FIG. 1 is a perspective view of an embodiment of a magnetic level gauge for ammunition in firearms;
FIG. 2 is a top view of the embodiment;
FIG. 3 is a back view of the embodiment;
FIG. 4 is a first side view of the embodiment;
FIG. 5 is a second side view, opposite the first side view, of the embodiment;
FIG. 6 is a front view of the embodiment; and,
FIG. 7 is a bottom view of the embodiment.
The broken line showing of the portion of the claimed design in FIG. 7 is included for the purpose of illustrating environment and forms no part of the claimed design.