Apache fireball rifle

just wondered if anyone had a diagram of the Apache Fireball rifle that was made in America. It is a bit of an unusual design as it has a .25 barrel with a liner so it can take smaller calibre pellets/bb's.

Has anyone got one.what do they shoot like, when good?

If you do have a plan or exploded drawing or know where one might be found then I would be interested to know,
Regards Mond