The ornamental design for a firearmsight, as shown and described.
FIG. 1 is a front upper left perspective view of a firearm sight, showing my new design;
FIG. 2 is a front elevation thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines in FIGS. 1-7 form no part of the claimed design and include dot-dashed lines that define the bounds of the claimed design and dashed lines that illustrate portions of the firearm sight that form no part of the claimed design.