It wasn't a factory concern for that model. Possibly Inventive crafting of an ordinary stock. Pictures would support to ascertain the appx yr your rifle was built. forty four It was presented from about 1959-1963. An additional defining characteristic from the JTSS is it came having a Winchester 93B front https://highimpactrounds.com/product/aguila-308-win-150-gr-fmjbt-2750-fps-20-rd-box/