I just got a Henry Big Boy in 357, and am trying to find a peep sight for it. Williams says none of theirs will work, and I really don't want a tang sight. Any suggestions?

I use a tang on my Marlins and most I know shooting lever silhouette also use tangs. I have no experience but I see a lot here will recommend Skinner sights. Assume they have one that will fit a Henry

Skinner makes sights for the Henry, but if I'm reading the descriptions correctly they aren't easily adjusted for the different distances in silhouette.

If a Skinner will fit why wouldn't a Williams FP GR TK fit? I have a Browning BL-22 and added the Williams and changed the front sight. I'm not 100% sure this would work for you, but look into changing the back and front sight (easier to do than I originally thought).
I added a tang to my Rossi M92 and love it. I get near-scope accuracy with tang. I think they look cool, but that's a personal opinion.
I'm sure someone on this site knows the correct combo of front sight and receiver sight.

Michael

The Williams FP-GR-TK is for a 22 lr dovetail scope mount. The rifle I'm talking about is a .357 magnum that is drilled and tapped for a scope mount, but Williams says the holes are set too far back for their sight and it keeps the hammer from functioning.