Your rifle also has a pair of the period correct Sako scope rings. If you look closely at the rear ring, you'll see it has a small tab that fits into a matching notch in the back end of the integral rear mount. This feature, in addition to the large, round, finger tightenable "nut" makes the scope a removable, return-to-zero mounting system. I installed these ring mounts on my Sako 75's when I bought them several years back even though Sako had introduced an "improved" system that was supposed to be for the 75's.