You will want to get the civilian version of the Vasteras refined sight adapter which is adjustable from 100 to 600 meters. The two military versions are in the 250 or 275 meter to 600 meter range, I forget exactl wat the starting marks on them are.
I think they are going in the $60 to $90 range when you can find one.
I believe this sight is commonly used in comps in Germany - I dont like it much myself. If you like shooting at ranges buy a proper range sight - I think they really make the rifle look a million dollars as well as easier to shoot better
Thanks for the link - I did not know that a company was making a similar "Tunheden" style sight. Originals made in Sweden(I believe) are very hard to find and expensive. I passed on a couple I have seen here and there & wish I did not pass on buying them. I may opt for one of the current made sights.