Possibly the best weapon-mounted light value on this site! - VISM Pro Series Rail Mount Flashlight 250 Lumens

This is not my favorite weapon mounted light. But, so far, it works as well as any that I've tried. My Streamlight Protacs are smaller and seem to be more ruggedly built, but this light functions about as well and is plenty bright. I wish the detents for high, low and strobe settings were a tad more positive, but I can't complain too much at this price. I have it attached to a tri-rail on a Mossberg 500 shotgun and it seems to be holding up well under the recoil. If it still works this well in a year I'd have to rate it five stars for value.