[balvenie]

IMO, with the Skinner not being a precision sight, I would expect the windage zero to vary as well as the elevation zero, whenever the peep was raised or lowered.
FWIW, I have a Skinner on my Mossberg 464 and had a difficult time adjusting it with the depth rod of a vernier caliper. I got it well zeroed nevertheless. I could be wrong but I don't think you can get a target quality, all-steel, peep for a sporting rimfire lever anymore, more's the pity.

 

[balvenie]

I've been shooting master in both rimfire and pistol cart. for a bunch of years, and the last "all steel" sight I had on a rimfire rifle was the Redfield on a 513T. I find the Williams target models are quite sufficient and absolutely repeatable. Shrps74 PS: It does seem that the older I get (67) the fewer master scores I shoot though...)

Sorry to labour the point and I could be in error too but aren't receiver sights made of aluminium, nowadays? And would they not wear out in time, leading to repeatability problems?