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I just bought a Fenix UC35 V2.0 USB but noticed a good selection of small size lights on their website. Not certain what all their diameters are but they also sell an adjustable rail mount for various diameters if thats whats driving the diameter requirement.
If it's for a weapon light, I'd suggest the Protac Rail Mount 1 or 2. It has the "scout" mounting system built into the body, which gives you a lot more options for mounts.
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