The Model 72A had some re-created parts, notably a strong lifter; the earlier a single was split. Model 72s had no pull-bodyweight adjustment screw as is identified within the 69As. 22LR, not to the 69A’s .22 S, L, & LR. I think that this meant which the chambering and rifling https://highimpactrounds.com/product/winchester-super-x-270-win-150-gr-power-point-2850-fps-20-rd-box/