For some reason, I found it super easy to kill BA.
Because the AC10/20 have a high refire rate, if you miss, just reaim and fire again - easy BA kills.
On top of that, I feel that the PPC has extra splash damage or splash size. I don't have to be as accurate with PPCs to kill BAs.
ALSO, mguns are still usefull against BAs.
AND medium lasers are excellent against BAs at long range.