Oh was my number too high or too low? Think about 10-15 J-15s with about 5 of those being serial models
There are six prototype J-15 single seat aircraft verified (551-556)
We have seen eleven Production aircraft (100-110). We saw production aircraft 110 on he factory floor being completed in March of this year.
So we know that there are seventeen single seat J-15 aircraft flying, six prototype and eleven production birds.
My guess is that 3-6 more production birds are being built at any given time, and maybe one or more of them have already been completed.
We have a complete thread about the J-15 on SD:
HERE, THIS THREAD
You cans see production birds 100-110 staring at the following post, and the one right after it:
HERE
You can see production brid 110:
HERE
Take discussion about the J-15 to that thread