Are the SureFire Turbo heads and bulbs interchangeable? I have a M4 I am thinking about running a KL6 on which would free up the Turbo head which I am considering running on my C2. So a more specific question would be (realizing that I would have to get the adapter plate from lighthound so a M4 Turbo head would screw onto my C2) Can I run a N2 LA in a stock M4 Turbo head? Are the LA's all interchangeable?