'jnida' - Your 'GunBroker' Krag has nice looking metal finish and patina. The rear-sight is a 1902 sight. Hopefully the rifle's bore is real nice.

Your stock appears to have been sanded and reshaped, in the area of the forearm 'finger-grooves' and 'comb' area of butt. The forearm 'shoulder', that the barrel-band once abutted, has been removed.

A hand-guard will no longer 'blend' neatly with the stock's forearm, since forearm dimensions, contour, and crisp edges are changed.

Your Krag's stock is not a good candidate for 'stretching' to original length and will likely look odd with an original hand-guard.

The barrel-band was likely 'reversed' to help clamp it in place; barrel-bands have a 'taper' and wood 'removal' probably left it loose.

It's a nice looking Krag and can be enjoyed, as is.

A cheap investment in Poyer's book, "The American Krag Rifle and Carbine", would help with a lot of basics and increase your enjoyment.