Tac-Light:
A thing to note is that if you plan on using it a lot, you may want to use a LED-based flashlight that can use AAA or rechargable batteries instead of the more conventional CR123A Lithium Batteries. This may save you money in the long run as the Lithium batteries are quite expensive (unless bought in bulk) and run down quickly compared to LED/battery fed ones I've found.
I carry around a LED-Lenser V2 Three A in black, worked wonders signalling blue forces at KS 2.5 and it's light enough that I carry it with my pistol indoors. And it's damn bright, not quite 'surefire bright' but it's still enough to give the 'deer in headlights' effect.
Of course: A lot of civilian tac-lights cannot be used mounted as they cannot actually mount onto guns (as they may be differing widths than the average mount or even a Weaver ring) or are impractical as they may be obnoxious colours, or don't have pressure switches (which I find handy). And there is at least one rechargable xenon-bulb lithium-ion tac light...
And as far as gear goes now: [shameless plug]I've found 204Tactical's molle kit more than satisfactory for beginner's gear, for those who really don't want to shell out hundreds of dollars on modular gear. I bought a replica weesatch with some pouches for less than $150[/end shameless plug]
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