The ornamental design for an ammunitionmagazine, as shown and described.
FIG. 1 is a left side elevation view of the ammunition magazine, showing our new design.
FIG. 2 is a right side elevation view thereof.
FIG. 3 is a bottom plan view thereof.
FIG. 4 is a bottom and right perspective view thereof; and,
FIG. 5 is a top and left perspective view thereof.
The broken lines and the areas within them depict portions of the ammunition magazine that form no part of the claimed design. The broken lines within the top of the ammunition magazine in FIGS. 1, 2, and 5 depict the unclaimed environment of ammunition.