I have got a Steyr Mannlicher Pro Hunter 2 and I would like to fit a scope that has got a 35mm tube. Unfortunately, I have not been able to find any Weaver style scope rings in 35mm. However, there are several 35mm scope rings in Picatinny style. Is it possible to replace the original Weaver receiver mounts on the rifle for Picatinny receiver mounts? If so, could anybody recommend some?