Arisaka just released their new Optic Leveler at a budget friendly $23. It’s a simple design, with your scope rings a bit loose you set the base plate on the Picatinny rail (or one-piece mount) and place the leveling wedge under the turret cluster of your scope, then tighten. Check them out at ArisakaDefense.com.
The Optic Leveler is an inexpensive, easy-to-use tool for leveling scopes mounted in rings or one-piece mounts. The base plate sits on the Picatinny rail or one-piece mount just below the turret cluster of a scope, which is intentionally left slightly loose in the rings so it can rotate. The leveling wedge is inserted from the side into the slot in the base. As the matching 11 degree ramped surfaces of the wedge and base engage, the top of the wedge rises upwards and contacts the turret cluster, causing it to spin until level. The user can then proceed to tighten the scope rings.