The scope is a NiccoSterling. The distance from the centerline of the barrel to the centerline of the scope is approx. 42mm. I also shoot a Browning T-Bolt 22LR with a NiccoSterling 6x24 44 and shoot .75 inches at 75 yds. so I am satisfied. I am sliding into 70 with arthritis and cataracts so benchrest shooting is my current shooting of choice. I have a 3 X 9 and can't see where the shots are hitting.