Mystery Swede

We found these photos of a Swedish semiauto conversion, and have no information on the design. Have you seen this rifle?

Mystery Swedish rifle

left side

right side more

top closed

top open

Any insights? The only reason we’re even saying it’s Swedish is the “Stockholms Vapenfabrik” inscription on the receiver. The rear sight is a Lange type like on a Gewehr 98, but I don’t know what (if anything) can be implied from that.