Abstract: A mounting apparatus and method for adjustably mounting, for example, an optical device to a rail interface of a firearm. The apparatus includes a base, a ring assembly configured to surround and grip the device, and at least two spacer members configured to be disposed and secured between the base and ring assembly. The ring assembly includes ring segments, a mechanism for securing the ring assembly to the base, and a mechanism for securing the ring segments together to grip the device therebetween. One of the ring segments has a support surface having a shape complementary to a support surface of the base. The spacer members are configured to be secured between the base and ring assemblies, and each spacer member has oppositely-disposed support surfaces configured to complementarily engage the support surface of either the base or ring assembly.

Abstract: A mounting apparatus and method for adjustably mounting, for example, an optical device to a rail interface of a firearm. The apparatus includes a base, a ring assembly configured to surround and grip the device, and at least two spacer members configured to be disposed and secured between the base and ring assembly. The ring assembly includes ring segments, a mechanism for securing the ring assembly to the base, and a mechanism for securing the ring segments together to grip the device therebetween. One of the ring segments has a support surface having a shape complementary to a support surface of the base. The spacer members are configured to be secured between the base and ring assemblies, and each spacer member has oppositely-disposed support surfaces configured to complementarily engage the support surface of either the base or ring assembly.

Abstract: A novel, adjustable locking windage and elevation knob assembly for the improved accuracy of scopes wherein an adjustment turn knob may be raised from its locked position to rotate freely for desired windage or elevation adjustments and thereafter be pushed back down into a locked position.