they are the companys own variations.
dunno too much about the D.A.R.T bolt, NEXUS say they're better but they would say that with planet bein their sponsor and all. the voodo bolt is cool, i got one. no lubing and you can run it at a lower pressure than the standard, that can only be good for your gun. i guess the plug behind the D.A.R.T is the way it applies the gas onto the ball,
send eclipse an email, i'm sure someone there will be more than happy to help.
HP