Add an Extrude modifier using an Amount of 0.1 units. Next align the extruded object with the dart body.
Under the Hierarchy panel hit Affect Pivot Only and then move the pivot at the bottom of the extruded object.
Finally, hit A to enforce Angle Snap and holding the Shift key rotate the extruded object 90 degrees clockwise. When Clone Options dialog appears set the Object to Instance and the Number of Copies to 3 and your realistic 3D dart is finished!
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