I have seen these floating around, usually a custom build. I have a gunsmith currently working on two designs for the small two AA battery "Mag-Lite". Hopefully he can come up with something that works well. As a base plan we are using the "Stinger" design by MAC and a much more simplified design used by Daniels. If he makes any headway, I will let you know, but he has been very busy and my project is a "back burner".
Bill