Another WAG: The OP may have been shooting a model 1912 NorwegianKrag
that has the rear-sight leaf from another Norwegian model.
That would explain the front-sight dovetail that goes 'front to rear', 'the small screw in the front of the front sight' (that doesn't seem to do anything) and the lack of windage adjustment in the front and rear sights.
Incompatible mixed sight parts!
(Norwegian model 1912 Karabin details):
Attachment 77128Attachment 77129