Hi Hoser,

If you have the same model as I did, there is two sections in the rib that has 2 screws in each, they un-screw and the base mounts then screws into these so any competent gunsmith should be ok with this even you, any gunshop that sells Chapuis can get them from the Importer in the USA then it is the same procedure as with any scope mounting.

Cheers,

Jeff Gray