The ornamental design for a firearmcompensator, as shown and described.
FIG. 1 is a front isometric view of a firearm compensator showing my new design;
FIG. 2 is a rear isometric view thereof;
FIG. 3 is a bottom isometric view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a side elevation view thereof; and,
FIG. 8 is a sectional view thereof taken along the plane 8-8 of FIG. 7.
The broken line showings illustrate unclaimed portions of the firearm compensator and the side not illustrated is a mirror image of the side illustrated in FIG. 7.