A shim is a very precise, thin wafer of brass used to raise or lower a scope suffering from enormous elevation adjustment problems. If your scope is having problems—such as requi-ing 10 MOAs from the mechanical center to reach boresight—you may have consumed so many MOAs that you cannot later adjust the scope for dead-on aiming during long-range firing.
By inserting a shim between the rear scope base and receiver, you can raise the point of impact and greatly increase "up" MOAs. A shim placed beneath the front base will lower point of impact and increase the "down" MOAs. These shim widths and resulting MOA changes are:
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