This is to put in the left over space after you have extended the barrel. To install, you will need to start by removing the six screws in the retaliator barrel extension. There is a rim in the middle of the barrel. Move the barrel out so that this rim sits against the orange end of the barrel (or just print two and don't use the orange part). .
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/bD0puhBuxaP
nerf_retaliator_barrel.stl | 12.6KB |