They can be worth more / less depending on the receiver markings. Some of the earlier guns (H/K 41) are very desirable. I own a 91 and 93.
I have a rare .22 L/R conversion kit made specifically for the Semi-Auto 91, NOT the surplus G3 .22 L/R that are commonly seen. My 91 is an early 80's with green furniture and a medium bipod that is mounted just forward of the magazine well.
The wood furniture on the 91 in your picture may be switched out / added. Again, receiver markings are important to know what the rifle is.