Upon receiving an original front sight cover for my 1898 long rifle, I quickly confirmed that my front sight was much to tall (see photo).  Poyer's reference states that the tallest U.S. Krag sight measured .41", so I was not surprised when mine measured .48"!  The sight looks pretty legitimate in every other way, but I still suspect this is some sort of aftermarket thing.  However, before I attempt to replace it, is anyone aware of taller sights ever being issued or used for this model or any other Krag?  Would just hate to remove or destroy something that might otherwise be rare.  I'm pretty sure that's not the case, but just wanted to ask the experts before I do anything.  MANY thanks!

Neither height nor shape of that blade are even close to any SA Krag product.

An original Krag front-sight pin has a slight taper and should be driven out 'left to right'.

Per Brophy, model 1898 Krag rifle blades measured an average of .413" (for ten samples measured).

(PM me, if you are unable to locate an original blade and pin. I probably have a spare I can sell).

Some photos of model 1898 rifle sight-blades. Second photo displays need to remove blade in order to remove front barrel-band. Last photo contrasts rifle and carbine blade.

The high front sight may have been installed to let the shooter use the original Krag sights at 50 or 100 yards, maybe even with handloads.  Perhaps you should try it at the range before you replace it.

Accuracy can be had even if the calibrations on the leaf don't match the range.  The 1898 I use in matches is set at about 250 yards, even though I'm shooting at 200.  That's the beauty of the rear sight on the Krag (mine's a 1902):  There is adjustment between the set points!  Not the case with other rifles...