It wasn't a manufacturing unit concern for that model. Probably Resourceful crafting of an ordinary inventory. Pictures would assist to determine the appx yr your rifle was created. 44 22LR, not for the 69A’s .22 S, L, & LR. I believe that this meant the chambering and rifling had been https://highimpactrounds.com/product/winchester-super-x-270-win-150-gr-power-point-2850-fps-20-rd-box/