It wasn't a factory difficulty for that model. Probably creative crafting of a regular inventory. Photos would support to find out the appx yr your rifle was created. 44 It was presented from about 1959-1963. One more defining characteristic from the JTSS is it arrived by using a Winchester 93B https://highimpactrounds.com/product/winchester-super-x-12-ga-2-75in-1-oz-8-lead-1290-fps-25-rd-box/