A good idea on the rail but not on the rings. They invite overtorqueing of the rings. According to a Famous maker of scopes, the most damage they see in returned scopes is due to overtightening the rings. The slotted screws make it tougher to over tighten. It seems that I see the admonishion to really tighten those rings screws is common on a lot of posts. If there is danger of slipping dust the rings with a little rosin and only torque to the makers specs. Why take a chance on ruining an expensive scope?

El Lobo