Swedish Mauser
On the top of the receiver ring is the name of the maker and date of manufacture. Serial numbers also help. They are found on the left side of the action, along with two Letters of the Inspector who passed it. This rifle was built in 1899 by Carl Gustafs State Armoury, and is quite early production. It should be a m/96 rifle originally, although a few m/94 Carbines were also built during this period. If the barrel is longer than 18 inches, it was built as a m/96. The stock for this date was Walnut.
It looks like the stock has been heavily sanded, as the metal on the tang is standing "proud" at least 1/16 inch above the wood. The bolt handle has been nicely bent in the European style. It is possible that this rifle was once a target rifle with a Lyman or Faldt rear sight on it, but more likely this sight modifications were done when it was sporterized. The wood at the cut out for the bolt and sight are a bit rough, leaning more toward a home modification as the Swedes took care and pride in their rifles.
As mentioned, pictures of the whole rifle, the top of the receiver with the holes, the rear sight if the original one is still on the barrel, and the markings on the receiver ring will tell more if you post them. A couple of pictures of your rear sight will help, and if it is a Diopter rear sight, there were only about 7 types officially approved.
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