Well, bear with me on this one.
One of my favorite projects was improving the Henry Rifle for a small profile survival package.
I will mention some of the problems with this platform and show some practical solutions as well.
1. The first problem is that there is only a receiver integrated 3/8" dovetail style "rail" to which a picatinny adapter needs to attached as a requisite to mounting most other practical optic options. The adapter has to be easily removable otherwise the receiver is not readily conditioned to be stored in its butt stock location. Short answer, a red dot optic is the best practical solution.
2. A tool-less solution of tightening said adapter is preferable, otherwise more gear to take along just to mount the optic chosen.
3. The butt stock "cap" is quite easily displaced upon simple impact......there goes all your rifle components in the dark, in the water, wherever; so a simple solution to retain the "cap" is mandatory for packing about on the run.
4. The firearm components when disassembled fit into a floating but not watertight butt stock; the external surface is slippery with no obvious manner to attach a sling or carry the survival tool without encumbering one of your survival hands.
Some optic mounting configurations; some for fun some for real.
I finally settled on the Vortex Sparc.