Inside of the battleforce for tyranids there are:
8 gaunts
8 hormagaunts
8 genestealers
3 warriors
1 carnifex

Now, there is no ripper bases on the list.
The gaunt box and warrior box both come with a ripper base. On the gaunt box the rippers are not on an additional sprue but there is one ripper on pretty much each sprue. I am not sure about the warriors.

Now since the 2 ripper bases are not listed on the battleforce, does that mean they put a different sprue into the battleforce so as not to include the rippers or what?

Any help is great!