J-20 can probably do 6 PL-12 missiles in its bay. The 2+2 pylons was what we saw with the demonstrator. We haven't seen pylon mounts on the production version yet.Ideally this fighter would be able to carry 2 PL-10s and 4 PL-12s internally but if its weapons bay is the same width as that of the J-20's then it will be more likely 2 + 2, which seems a little short-handed as far as MRAAMs go.