I finally found a small bore light that I saw several years ago.Actually,it is a light for a fishing float.The light is small enough in diameter to easily fit down a .22 size bore.Lindy fishing tackle is the importer of it.The one that I found has a red lamp on it,I don't know if they come in a clear or not. I tried it in my .32 cal.Bedford,and the bore showed up real nice.On the package the instructions says it willl last 20 hrs.of continuous service.the # on the package is LF110"thill nite brite"