1.0-6 dips non adjustable AOC no wrap around grips.
1.8-6 dips adjustable AOC no wrap around grips.
2.0-wrap around grips 8 switch board adjustable AOC
2.2-Rechargeable battery,turbo valve (better efficiency) Tool kit,derlin bolt,turbo,double trigger, new chip and "improved?" barrel
^Copied from the sticky.
But the different styles such as BBT, Twister, Fluster, etc. the only difference is milling.