I guess I'm a Type II guy. I do have a Type IV as well, and an SP1, which would be a sub-Type I due to the lack of a light. It's the Type II that I'd grab if needed though.
There are four types of AR carbines. I just have different parameters.
1) short range 0-100yards
2) medium range. 0-300
3) long range. 0-600
4) lights out, night time 0-600