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Wrap some rubber or electrical tape or both around the light till it fits. If you want to get fancy you could search for a plastic spacer the right size and cut it in half....
Yeah I tought about it but I don't have any mount at the moment so why not get one that will do the job. Any standard mount that would be cheaper than the Elzetta?
Be carefull with mounting a cheap flashlight on a shotgun, the recoil might shake the inside apart, I broke a few lights that way. Go with a Fenix, they're good.