I just wanted to expand on this a little bit to make sure there is no confusion.

LOTC stands for lock out tailcap. This simply means the ability to prevent accidental activation. The way Surefire implements this typically (I can't think of any exceptions) is to allow the tailcap to be unscrewed enough so that it cannot be activated.

As far as I can tell, all current Surefire models have this feature, including all the models we having been talking about: G2, 6P, and E2e.

However, until semi-recently, the G2 did not have this feature. While Surefire has been shipping the revised G2 units for quite a while now, it is possible there are some in the retail channel that still do not have this feature.

This thread talks about how to tell if a given G2 has the older, non-LOTC model or the current LOTC model. The easiest way to tell is to remove the tailcap and press the button. If the guts of the tailcap fall out, it is the old, non-LOTC model. The tailcap of the LOTC model is also slightly longer, but this doesn't help unless you have both models side-by-side to compare.

The other issue is the click-on-click-off feature. Most flashlight geeks call this a "clickie" tailcap. Only a very few SF models come with this feature (E2e, U2), but almost all of the models can be retrofitted with an optional tailcap (the main exception are the two stage lights like the L1, L2 and A2 which are incompatible with the clickie style tailcaps).

The SF G2, 6P and M2 lights can be fitted with the Z48 or Z49 tailcap to provide this feature (only difference is color) and older E2e or E1e lights which shipped without this feature can be retrofitted with the Z57 or Z61 tailcaps (again, only difference is color). All can be seen on SF's website.

-john