Was it the lack of interest or the emergence of cheap China knock-offs that killed the idea?
BSA sgf160 was 1/4 the price for 1/2 the lumens, and it seems to be long gone too.
Or was it the fact that 'tacticool' users put on mag tube extensions more often than not and are unable to use the tube-end light?
The idea of not having to put any additional bases/mounts on a shotgun, to have a light on it, sounds pretty cool to me. I must be missing something.