The 1892/96 conversion rifle I have that has the rounded channel fill (from the front of the barrel band perspective) is serial number 3474. This rifle has the curved butt plate, 3 holes and oil recess drilled and still has the 1892 bolt. It does have the newer side plate and the hold open notch and pin, of course. It has the rounded muzzle and the 1896 rifle sight.

So much for absolute details with Krags!