If it's a matt or satin finish stock, you'll need a soft oil like Schaftol which soaks into the grain, but only apply light coats and allow to fully dry for a day or two. Then simply buff with a soft cloth like flannelette.
If it's a more high gloss finish, then you'll need a hard oil like Nill Griffe. Only apply in very light coats, as it drys like a varnish of sorts, and allow to fully dry for several days before soft buffing with a cloth. This is often used on high end pistol grips.
Both products are made in Germany, and unsure where you purchase in NZ, but Hermans Guns in Victoria, Australia were happy to airmail these to me 18 months ago.
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