Photos can deceive, but there still seems to be a bit of color in your Krag's receiver and magazine-gate. You can probably just leave things as they are.
To my eye, the finish on the barrel-band and darkness of the handguard are more distracting to the overall appearance. Still, a nice carbine to use and enjoy.
Attached photo of two 1899 carbines to show a relatively common receiver appearance.Information
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