The best application of the Eagle vision INS adjustable scope mount is for people who want to reach out far more than other ordinary mounts allows them to. By keeping the front mount at its low and elevating the rear mount you can sight in your gun far beyond fixed mounts allow you without wasting your elevation on the turret. Therefore keeping the optical center of your scope intact great choice for extreme long range shooting. These rings ship with a base for picatinny scope rails, adapter to fit dovetail can be purchased separately.