The ornamental design for the pistol holder, as shown and described.
FIG. 1 is a perspective view showing my new pistol holder;
FIG. 2 is an alternate perspective view thereof;
FIG. 3 is a right side elevational view thereof, the left side being a mirror image thereof;
FIG. 4 is a front elevational view thereof, the rear view being a mirror image thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a cross-sectional view thereof, the view being taken along line 7-7 of FIG. 3.
The broken lines forming a cylinder on the bottom of the pistol holder form no part of the claimed design. The broken line showing of a pistol in FIG. 7 illustrates environment and forms no part of the claim.