What we know is that these suction darts are more dense and seem to travel much more accurately and at a longer range than the original Buzz Bee suction darts. Those that came with the Range Master were the traditional yellow foam and purple rubber. These Extreme darts that you can buy separately come with black foam and yellow rubber. That's cool, because it will be easier to tell the ammo apart if you have a lot to sort after each war!
There are several new blaster in the Extreme line that came out on shelves this Summer. It would make sense that all the Extreme blasters come with the new version of the ammo as well, but I haven't confirmed that for myself yet. I'm really looking forward to trying out some of the new Buzz Bee blasters soon -especially the Side Winder and the Auto Tek 20. Interestingly, those don't carry the "Extreme" name on them. Not sure what gives yet!