+1 for Bastards.
It would be prudent to have BBs available for sale anyways. And many games/fields have a "bio only" policy. Highest quality bios I have used, are in fact bastards. Green Devils are also a solid bio BB.
It is very true however, that players are picky about the BBs they use, and so are certain guns.
I’ve developed a new sport I call ‘Airhard’. It’s basically Airsoft, except while you play you must maintain a massive erection...