The ornamental design for a magneticgun mount with trigger guard, as shown and described.
FIG. 1 is a front, top and right side perspective view of the magnetic gun mount with trigger guard showing my new design in which the front, top and left side perspective view is a mirror image of the front, top and right side perspective view.
FIG. 2 is a front view thereof.
FIG. 3 is a back view thereof.
FIG. 4 is a right side view thereof, in which the left side view is a mirror image of the right side view.
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The broken lines in the drawings depict portions of the magnetic gun mount with trigger guard that form no part of the claimed design.