Buttstock for firearm

FIG. 1 is a front top perspective view of a buttstock according to the new design;

FIG. 2 is rear bottom perspective view thereof;

FIG. 3 is a right elevation view thereof;

FIG. 4 is a left elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front elevation view thereof; and,

FIG. 8 is rear elevation view thereof.

All dashed lines comprising short dashed lines shown in the drawings are for environmental purposes and form no part of the claimed design. All dashed lines comprising long dash-short dash-long dash lines depict boundaries between claimed and unclaimed portions of the design.