looks like the forend is somebody's custom job.
Sweden adopted the Remington-Rider rolling block action in 1867. It was chambered for the 12.7x44R rimfire cartridge. The Swedish government purchased 10,000 complete rifles from Remington and 20,000 actions to enable them to convert the existing stock of m/1860 Wrede muzzleloading rifles. The Swedes also began domestic production of the rifle by Husqvarna and the Carl Gustaf rifle factory, who made complete weapons in various configurations.
All the m/67 rifles and their variations originally had a sight graduated from 800-1400 feet, this was replaced in 1879 with one in metric graduations. Some weapons had new sights but many simply had the old graduations barred out and new ones from 120-300m stamped on the bed. A new leaf marked from 350-900m was added.
Around the mid-1870s shooting clubs started using the commercial German-made 12.7x44R centerfire cartridge, which gave them significantly better performance (they could also reload the expensive cases). However when competing in Service Rifle matches, or for prizes donated by the army or the Crown they had to use the issue rimfire cartridge (no 12.7mm centerfire cartridge was ever adopted by the Swedish Army). Thus, the serious marksman bought a replacement centerfire breechblock and kept both handy.