I've tried putting the terms into a translator, but it just gives me the "raw" translation (which is sometimes quite funny) I need to know what they actually refer to in the gun world.

These images are of verney-carron double options, and I would like to ask my dealer if he can order a rifle with these options, but I want to make sure I'm using the right terms.

I know for instance the last one is a Skeleton Butt Plate, but I want to be sure that's what there calling it in the catalog

Thanks.