The Sonic Micro Dart is a Micro Dart that whistles when fired from a wide range, which is created by a small opening at the top of the dart which emits a sound when traveling at a quick enough speed. These darts have since been replaced by Whistler Darts. These darts can be found in Ammunition Bag Kits, Tactical Lights and other Nerf sets. It was introduced in 2002, but only sold in Mega Dart format, and only came to Micro Dart format in 2003.
- The Whistler Darts, its replacement, are almost identical with the exception of a color swap.