Take it all apart and do it properly as I indicated before, with the level check at each addition of base, rings, and then scope. Then you will know if something is adding an inclination where it should have been level with the firearm. If the rings or base are adding a tilt, then you'll know it's not the scope. Do your geometry.I honestly don’t know what the bases are. They were on the rifle when I bought it. I bought the scope second hand off Gunpost, and the rings were attached to It. Scope looked to be brand new. I only paid $50 for it, so no big loss if it is no good. Maybe there was a reason it was on Gunpost.