The ornamental design for a firearmlightweightbilletstock, as shown and described.
FIG. 1 is a perspective view of a firearm light weight billet stock showing the firearm light weight billet stock attached to a firearm. The firearm, shown in dashed lines, is not claimed.
FIG. 2 is a front view of the firearm light weight billet stock of FIG. 1.
FIG. 3 is a back view of the firearm light weight billet stock of FIG. 1.
FIG. 4 is a right side view of the firearm light weight billet stock of FIG. 1.
FIG. 5 is a left side view of the firearm light weight billet stock of FIG. 1.
FIG. 6 is a top view of the firearm light weight billet stock of FIG. 1; and,
FIG. 7 is a bottom view of the firearm light weight billet stock of FIG. 1.
The broken lines in the figures illustrate firearm environment and portions of the firearm light weight billet stock that form no part of the claimed design.