The bezel size is the flashlight head, not the plastic cover. The difference between M900 and M910 is the type of mounting hardware it comes with. One is a throw-lever mounting system, while the other is a thumb screw. Surefire website shows this in detail. If you want a dedicated sniper tac light light, you'll need to look at their 12v system similar to Surefire M4 Devastator. The M900 vertical grip lights are only 9v.
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