I'll have to bookmark this for posterity. This is a great thread. I am wondering if you could use the correct size tube in which to mount the stone. Then leave the muzzle end open and cut some windows in the tube top if necessary for more light. Thanks for all the pictures. I see that my 412 and my 1895 45-70 will both need these sights. I will get into some pretty dark brushy places on the hunt. Morning and evening it will be a help to seeing the front sight. Rustyzipper