[senghing27]

I currently own a J2L and a T2, owned S6s in the past, and had a opportunity to mess with a 6.5
Pump stroke on the T2 is by no means flimsy. I would say the pump stroke on both are the same, it really just depends on how you use the return spring setup, keep the stock ccm lowers, etc,etc.
The 6.5 is the standard body and the T2 is the tube body. The T2 has the ability to have an insert system and switch the top tube for other things where as the 6.5, you don't have that ability.
If you can, just use someone's and see how they feel in your hands. I used the 6.5 and really didn't care for it.
All the other questions I would just call CCM directly and see what they say.