I also used this peep sight and it works great with existing front sight. Just have to drill & tap one hole in receiver cover. I also put a dimple in for the elevation adjustment screw..
I opted for the K.I.S.S. principle.
Williams WM-96 replacement peepsight, originally intended for replacing the open rear sight leaf of military Mauser 93/94/95/96/98 rifles.
$25 (when I bought it, probably $30 now), not a clip-on for the Henry - I d/t'd one 6-48 hole in the receiver cover to mount.
It zeroed in less than 5 shots.using the issue front sight (which I painted)
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