Winchester 1886s and 1892s can function with a tang sight installed. While I have owned and shot these models - mine and those of friends - all of them had a Marble's spring-loaded tang sight installed. Although I have not known of one of these lever rifles having a vernier or Soule vernier sight installed, MVA's #134, for example, will fit either so long as correct sight base is used.
Are there reasons to use such a sophisticated sight rather than the significantly less expensive Marble's tang sight - for example, less liable to be injured or ruined by dropping the rifle with sight stem extended, or better or more consistent accuracy as range to target/animal passes 150 yards?