It wasn't a factory challenge for that model. Probably creative crafting of a standard stock. Pictures would enable to ascertain the appx 12 months your rifle was designed. forty four 22LR, not for that 69A’s .22 S, L, & LR. I think this intended the chambering and rifling ended up https://highimpactrounds.com/product/winchester-super-x-12ga-2-75in-1oz-6-lead-shot-1290fps-25-rd-bx/