I would like to address post #1. I have posted some pictures on scoping your Big Boy. Here is an example of 2. First, you get the scope base from Henry (about $30). I used loctite on the threads and made sure that the base is straight. There is enough play in them to warrant a slight warning.
The example shows the Vortex 1.75 X 5 scope with Leupold quick detach rings. I was thinking that the iron sights would still be usable with the scope removed, but they are not. You can set the rear sight to the highest and get a sight picture, but it is less then perfect.
The other Henry with the big loop is a 45 colt, and a Leupold VX-3 1.75 By 6. Both scopes are 32mm and use MED rings. I will include a picture of the big loop as well. It is an easy install.
Also, just a note. These rifles are heavy and adding a scope is not such a big thing. I wouldn't want to carry it all day. I use them for teaching new shooters and to make steel plates resonate a loud "PING!".
I hope that answers the question that you had, IF not, please ask away.
http://i1091.photobucket.com/albums/...ry/1scope1.jpg
http://i1091.photobucket.com/albums/...ry/4scope4.jpg
http://i1091.photobucket.com/albums/...ry/3scope3.jpg
http://i1091.photobucket.com/albums/...ry/5scope5.jpg
http://i1091.photobucket.com/albums/...ry/7scope7.jpg