Here is the factory CCI Phantom Stock Class Feed Ball Retainer.
This is the one-way feed gate that goes in the loading end on stock class pump markers.
This is one of the few parts of a CCI Phantom that wears out so keep one handy in your gear bag!
CCI Phantom Stock Class Feed Ball Retainer features:
Fits in CCI and other stock class marker feed tubes - Allows quick reloading via 10 Round Tubes