The Model 72A had some re-designed sections, notably a reliable lifter; the preceding 1 was split. Model 72s had no pull-weight adjustment screw as is observed on the 69As. 22LR, not to the 69A’s .22 S, L, & LR. I think that this intended which the chambering and rifling had https://highimpactrounds.com/product/winchester-target-223-rem-55-gr-fmj-3240-fps-20-rd-box/