The ornamental design for a firearmmagazinebody, as shown and described.
FIG. 1 is a rear, right, top perspective view of a firearm magazine body showing our new design;
FIG. 2 is a front, left, bottom perspective view of the firearm magazine body of FIG. 1;
FIG. 3 is a right side elevation view of the firearm magazine body of FIG. 1;
FIG. 4 is a left side elevation view of the firearm magazine body of FIG. 1;
FIG. 5 is a rear elevation view of the firearm magazine body of FIG. 1;
FIG. 6 is a front elevation view of the firearm magazine body of FIG. 1;
FIG. 7 is a top plan view of the firearm magazine body of FIG. 1; and,
FIG. 8 is a bottom plan view of the firearm magazine body of FIG. 1.
The broken lines showing portions of the design in all figures are included for the purpose of illustrating environment and unclaimed features and form no part of the claimed design.