Back in the day the slide called the long slide was numbered to 150 on the elevation scale. The Lyman 48C on he Springfield .22's had an elevation scale numbered to 125. Perhaps your sight has a base that I call the shallow base. It does not fill the mortised out place in the stock. The later sights, post WW II, had the shallow bases. These were designed to fit over the stock and did not require the cutout. If you could post or email me a pic of the sight I might help you determine what is wrong. hsggbar@gmail.com.
