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A scope mount base design which readily accepts onto a preexisting rear sight base without any alteration of the sight base except for the easy removal of the original sight leaf and mainspring. This scope mount invention achieves solid lockup by the use of the appropriate sized threaded support fix

A scope mount base design which readily accepts onto a preexisting rear sight base without any alteration of the sight base except for the easy removal of the original sight leaf and mainspring. This scope mount invention achieves solid lockup by the use of the appropriate sized threaded support fixtures and scope mount configuration to successfully engage these rear sight slots that originally contained the sight leaf and mainspring, and thus achieve strong lockup of the scope mount to the sight base.

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I claim: 1. An apparatus for connecting a telescopic sight to a sight base of a rifle, the sight base having an anterior sight base portion and a posterior sight base portion, the anterior sight base portion defining a pair of inwardly-projecting opposing bosses, the apparatus comprising: a. a body

I claim: 1. An apparatus for connecting a telescopic sight to a sight base of a rifle, the sight base having an anterior sight base portion and a posterior sight base portion, the anterior sight base portion defining a pair of inwardly-projecting opposing bosses, the apparatus comprising: a. a body having anterior and posterior body portions, said body being configured to receive and to secure the telescopic sight, said anterior body portion defining a pair of boss slots on opposing sides of said anterior body portion, each said boss slot being configured to receive and to slidably engage a one of the inwardly-projecting bosses of the sight base, the posterior portion of the sight base defining a pair of opposing spring slots; b. a T-nut, said T-nut having two wings, said two wings being configured to slidably engage said pair of opposing spring slots, said T-nut defining a threaded T-nut hole; c. a tension screw having a screw head, said tension screw being configured for threaded engagement with said T-nut hole, said body defining a tension screw clearance hole, said tension screw clearance hole being configured to receive said tension screw and to retain said screw head, whereby said T-nut, said clearance hole and said tension screw are configured to apply a tension to the body drawing said body toward said sight base when said body and said sight base are in engagement, said two T-nut wings are in engagement with said pair of opposing spring slots and said tension screw is in engagement with said body and said T-nut. 2. The apparatus of claim 1 wherein said body defines a T-nut slot on a lower side of said body and wherein said rifle has a barrel defining a bore, said bore having a bore longitudinal axis, said T-nut slot being configured to engage said T-nut, said engagement between said T-nut slot and said T-nut being sufficiently close that said body is substantially prevented from moving in a direction lateral to said bore longitudinal axis when said two wings of said T-nut are in engagement with said spring slot and said T-nut slot defined by said body is in engagement with said T-nut. 3. The apparatus of claim 1 wherein the site base is a two-part site base having a first part and having a second part releasably mated to the first part, the first part defining the pair of bosses, the second part defining said pair of spring slots, the apparatus further comprising: a. a compression screw; b. a threaded compression screw hole defined by said body, said compression screw being configured for threaded engagement with said compression screw hole, said compression screw hole being located and said compression screw being configured so that said compression screw may bear upon said second part of said two-part sight base when said pair of boss slots defined by said body are in engagement with the pair of bosses defined by said first part of the sight base and said compression screw is in engagement with said compression screw hole, said bearing of said compression screw on said second part of the sight base applying a compression to said compression screw, whereby when said compression is applied by said compression screw and said tension is applied by said tension screw, said second part of said two-part sight base in a firm engagement with said first part of said two-part sight base. 4. The apparatus of claim 1, the apparatus further comprising: a. a spacer; b. a spacer bolt, said spacer bolt being configured to releasably secure said spacer to said body, said spacer being configured to engage the posterior sight base portion and to support said body when said spacer is secured to said body and said body is in engagement with said sight base, said spacer having a thickness, said thickness being selected to determine an angle of said body to said bore of the rifle. 5. The apparatus of claim 4 wherein said T-nut is a one of a plurality of said T-nuts, said spacer being selected from among said plurality of said T-nuts. 6. The apparatus of claim 5 wherein each of said plurality of said T-nuts has a one of a plurality of predetermined thicknesses, said spacer being selected based upon said predetermined thickness of said selected T-nut. 7. An apparatus for connecting a telescopic sight to a sight base of a rifle, the sight base having an anterior sight base portion and a posterior sight base portion, the anterior sight base portion defining a pair of inwardly-projecting opposing bosses, the apparatus comprising: a body having anterior and posterior body portions, said body being configured to receive and to secure the telescopic sight, said anterior body portion defining a pair of boss slots on opposing sides of said anterior body portion, each said boss slot being configured to receive and to slidably engage a one of the inwardly-projecting bosses of the sight base, wherein the rifle has a bore and the anterior portion of the sight base has an opposing pair of upward projections, a one of the pair of bosses being defined by each one of said upward projections, said upward projections having a lower end, said lower end of each of said pair of upward projections being attached to the sight base, said body being configured to be bolted to each of said pair of upward projections, said body being configured so that each of said pair of bosses applies a force to said body generally in a direction toward said bore of the rifle when said body is bolted to said pair of upward projections. 8. The apparatus of claim 7 wherein each said upward projection elastically deforms by rotating about said lower end of said upward projection when said pair of upward projections are bolted to said body, the pair of inwardly-projecting opposing bosses each has a boss lower side and said pair of boss slots each has a boss slot lower side having a width, said configuration of said body to be applied said force in said direction of said bore of the rifle comprising each said boss slot width being sufficiently great and said engagement between said boss slot lower side and said boss lower side being sufficiently close that said boss lower side bears on said boss slot lower side in response to said elastic deformation of said upward projection when said upward projection is bolted to said body. 9. The apparatus of claim 8 wherein each said upward projection defines a boss through bolt hole, said boss bolt through bolt hole being configured to receive a boss bolt for connecting said upward projection to said body, said boss bolt through hole defining a boss bolt hole longitudinal axis, said boss through bolt hole longitudinal axis substantially bisecting said boss lower side, said configuration of said body to be bolted to each of said pair of upward projections comprising said body being configured for threaded engagement with said boss bolt when said boss bolt is received by said boss through bolt hole, whereby said threaded engagement between said boss bolt and said body resists said force in said direction of said bore of said rifle, whereby said rotation of said upward projection when said pair of upward projections are bolted to said body loads said boss bolt in flexion, and whereby a combination of said force in said direction of said bore, said resistance to said force by said threaded engagement of said boss bolt and said body, and said flexion loading of said boss bolt together provide a substantially rigid connection between said body and said upward projection. 10. The apparatus of claim 9 wherein the rifle is a Mauser 98 rifle. 11. An apparatus for connecting a telescopic sight to a sight base of a rifle, the sight base having an anterior sight base portion and a posterior sight base portion, the anterior sight base portion defining a pair of inwardly-projecting opposing bosses, the apparatus comprising: a body having anterior and posterior body portions, said body being configured to receive and to secure the telescopic sight, said anterior body portion defining a pair of boss slots on opposing sides of said anterior body portion, each said boss slot being configured to receive and to slidably engage a one of the inwardly-projecting bosses of the sight base, wherein the rifle is a Mauser 98 rifle, the pair of inwardly projecting bosses defining a pair of boss lower surfaces, each of the pair of boss lower surfaces bisecting a boss through bolt hole, each boss through bolt hole defining a boss through bolt hole axis, each bolt hole axis generally being coincident with a plane defined by the boss lower surface, each said boss slot defining a boss slot lower surface, each said boss slot lower surface being configured to mate with a one of the pair of boss lower surfaces when said boss slots are engaged with said bosses, said body being configured to be bolted to each of the pair of bosses by a bolt passing through the boss through hole and into threaded engagement with said body, said mating of each said boss slot lower surface and each boss lower surface being sufficiently close that a deformation in rotation of the boss in response to said bolting of said body to each of said pair of bosses causes a resulting tilting of the boss lower surface to press against said boss slot lower surface, whereby said tilting of the boss lower surface clamps said body between said boss slot lower surface and said bolt.