Abstract: A universal mounting system for mounting a scope fitted with Weaver style rings to a standard 3/8" or other suitably grooved receiver typically associated with a small caliber firearm. A first embodiment of the invention includes an adapter plate configured to be secured to a base of a tipoff or dovetail style scope mounting system. The adapter plate of the embodiment also includes a central aperture and clamping members provided to secure a Weaver style base to the adapter plate through the use of fasteners. Another embodiment of the present invention includes a base configured with a grooved bottom portion for engaging a dovetail grooved receiver of a firearm. A top portion is rigidly or integrally secured to the bottom portion and exhibits the characteristics of a Weaver style base.