The Model 72A had some re-created areas, notably a solid lifter; the prior a single was split. Model 72s had no pull-excess weight adjustment screw as is identified about the 69As. 22LR, not to the 69A’s .22 S, L, & LR. I presume that this meant the chambering and rifling https://highimpactrounds.com/product/winchester-m193-5-56-nato-55-gr-fmj-3180-fps-200-rd-box/