Bought a new sightron s111 10 x 50 a month ago, went to the range and could group 3 bullets touching, next 3 would pull 2 inches right and 2 inches low and still touching . After several hours and wasted rounds i found that the ocular ring was moving, so much that at 200 yards i could move the dot 10 inches in all directions, it seems that the threads were were very loose. Sent it back and got a replacement. I received the replacement yesterday and mounted it on my rifle to find the same problem. To me it is a design fault in these scopes as there is no locking screw on the ocular ring. Has anyone else had this problem? . My only remedy was to put a cable tie around the ring and tighten the ocular knob until it went up against the bell tight.