The ornamental design for a nailgunholder, as shown and described.
FIG. 1 is a front elevational view of my new design for a nail gun holder, the broken dash-dot lines showing the stitching in this and the FIGS. 3 and 6 views are for illustrative purpose only and form no part of the claimed design.
FIG. 2 is a left side elevational view of the nail gun holder shown in FIG. 1, wherein a right side elevational view (not shown) is a mirror image thereof.
FIG. 3 is a back elevational view of the nail gun holder shown in FIG. 1.
FIG. 4 is a top plan view of the nail gun holder shown in FIG. 1.
FIG. 5 is a bottom plan view of the nail gun holder shown in FIG. 1; and,
FIG. 6 is a front perspective view of the nail gun holder shown in FIG. 1, the broken line outline of a nail gun is for illustrative purpose only and forms no part of the claimed design.