This is a very simple way to jam any Nerf clip system gun.
What you will need:
1 tip-less streamline dart
1 rubber band
Step 1: Make the Jamming Dart
To make the jamming dart simply wrap the rubber band around where the tip was before, as shown in the picture below. Then just put the bullet in the clip, and when it gets into the chamber, the rubber band will stop it from shooting out of the gun, jamming it.