On surefire's site, they list the commander model as the 8AX. On brightguy.com, it is listed as the 8X 311. Is this the same exact light or is there a generational difference?
The 311 is the previous generation. That particular stock number comes with one B90, the overnight charger and AC and DC adapters. Full suggested retail price is $178.99 for a reference. The new 8AX has 2 B90's, AC/DC adapters and the 2-hour rapid charger for a SRP of $184.99. not to mention it's a much sleeker light. You do the math.
My 1998 Surefire catalog lists the model 8X311 system including an 8X flashlight, 1 B90 battery and a C311 AC/DC overnight charger (charges in 11 hours). This light is definately an older generation than the 8AX/8NX. Even if you can find an older model at a discount I would not recommend buying it. The current 8AX/8NX is a much better package at a more attractive price.