'Whig' - I believe the front screw, on Krag model 1892 and model 1896 rear-sights, normally stands rather 'proud'. This is the case with the examples I have and what I see in published pictures. The OP's sight mounting looks correct to me.

The 'countersink' for the front screw is not very deep on the model 1896 sight-base. (By contrast, correct model 1898 and model 1902 sight screws are nicely flush when in place).

Attached photo of 1896 carbine sight shows why a lot of the front screw-head would be visible.

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