I had one on a ZKK 601 .308. Really good scope, high quality for the era. Built tough, very solid and a little heavy. They are a Communist bloc Zeiss scope, just not quite as slim and refined as the West German Zeiss models. Vertical adjustment was straight forward, If I remember correctly you may need to loosen off a coin slotted lock screw first. No clicks. Once set, it won't change point of impact. Horizontal adjustment was with the mount screws. I never needed to adjust mine horizontally. The second turret is for image focus / diopter correction. Set it for your eyes and you're good to go at all practical ranges.