Help with 1899 Krag Carbine, please.

[Wizard]

Have a line on a 1899 Krag Carbine. Serial number 2291xx.
Stock has no plug, and has spring band.
Stock has cartouche with 1899. No P proof mark underneath. Hump sight protector. Sight is correct Buffington with a C on left. Stock looks to be a tad sanded, but not too much. Correct front sight but no cover. Bluing looks good. (Will try to post photos later.) There’s a small stamp of 173 on the top of the rear stock.

Questions:1. Does the serial number correspond with 1899 manufacture?
2. Would the hump forearm be an later update or is it possible to have one for this gun?
3. On the front sight, should the blade have a c stamp or would that only be on the sight cover?(sight cover missing.)

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