+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.
ďREALITY IS LIKE A STONE. TO MANY ITíS HARD AND COLD, THEY CANíT HUG IT OR EAT IT, IT ONLY FRUSTERATES THEM AND DOESNíT DO THEM MUCH GOOD. TO OTHERS ITíS STRONG AND DEPENDABLE, YOU CAN BUILD WITH IT, BUILD UPON IT, OR WORK WITH IT, ALSO USE IT TO SMASH PEOPLE IN THE FACE.Ē