Assuming your barrel is still 30" long you are very fortunate. 1901 and 1902 rear sights abound on Ebay, better yet Jack Schwartz/Parts for antique guns is selling Krag Forestocks and handguards after a big hiatus. You have a nice rifle there. I'm a big fan of the repro screws. If you are truly interested in the history of these rifles the best book for the money, hands down is by a former contributor. Here's the link:

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