The Redfield receiver sights made for the Norwegian Krag were not a "no-drill" sight.

They mounted on the right-side of the receiver and required drilling and tapping.
(I'm not totally sure how this thread got to 'Redfield-Norwegian sights')?

'quietriot' - Your Redfield 102-K sight appears tilted forward and not properly seated against the Krag receiver at the rear. (There is a gap between the sight base and receiver wall).

If you loosen the sight's rear mounting-bracket and lightly tap the 'top rear' of the sight-base, it should swing down and make contact with the receiver. Use a plastic mallet and light taps and tighten the bracket when the sight base is 'square' on the receiver.

BTW - Redfield, Lyman, and others made higher front-blades for the Krag with different gold beads and shapes. These give a better sight picture for Hunting and Target Shooting. They correct the low rear-sight problem you are experiencing. 

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