The scope mount is shown in Howe's Vol 2 page 267, figure 110 and it is a Niedner. Although it is different than my Niedner rifle with a Niedner scope mount and base on it so there must be at least two different Niedner scope mounts. Neither of them have a locking method for fore and aft but they do have a stop for when it's fully on the base and then just clamps tight.

Last edited by DanLH; 07/10/21 11:39 PM.