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A sighting device is mountable to a gun. The device includes a light source (preferably a laser), a power source connectable to the light source and a mount attachable to the gun so that the laser is juxtaposed either the top surface of the gun or a side surface of the gun. In one embodiment, the si

A sighting device is mountable to a gun. The device includes a light source (preferably a laser), a power source connectable to the light source and a mount attachable to the gun so that the laser is juxtaposed either the top surface of the gun or a side surface of the gun. In one embodiment, the sighting device includes a bottom rail mountable in a slot on the gun, wherein the slot is preferably positioned on the top surface of the gun. The sighting device may also include a mechanical sight that functions as the rear mechanical sight on the gun and/or a secondary light source.

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1. An apparatus including a gun having a slot, and a sighting device mounted on the gun, the gun having a grip and a body portion including a barrel, the body portion having a top surface, a back surface adjacent the top surface and above the grip, and two side surfaces wherein each side surface is

1. An apparatus including a gun having a slot, and a sighting device mounted on the gun, the gun having a grip and a body portion including a barrel, the body portion having a top surface, a back surface adjacent the top surface and above the grip, and two side surfaces wherein each side surface is adjacent the top surface, the slot being within 2 inches of the back surface, the sighting device including a first light source and a power source connectable to the first light source, the first light source having a first mode in which it emits light and a second mode in which it does not emit light, the sighting device mechanically mountable in the slot, wherein the slot is on either of the side surfaces of the gun or the top surface of the gun, so that the light emitted by the first light source travels along side either the top surface or one of the side surfaces of the gun. 2. The apparatus of claim 1 wherein the gun includes a slide. 3. The apparatus of claim 2 wherein the slot is formed in the slide. 4. The apparatus of claim 1 wherein the gun is a Glock pistol. 5. The apparatus of claim 1 wherein the gun is semi-automatic. 6. The apparatus of claim 1 wherein the gun is a revolver. 7. The apparatus of claim 1 wherein the slot is formed in the shape of a dovetail. 8. The apparatus of claim 1 wherein the gun is a Glock 17. 9. The apparatus of claim 1 wherein the gun is a rifle. 10. The apparatus of claim 1 wherein the gun is a shotgun. 11. The apparatus of claim 1 wherein the gun is a paint-ball gun. 12. The apparatus of claim 1 wherein the gun is an electronic stun gun. 13. The apparatus of claim 1 wherein the mount is configured to be pressure fit into the slot. 14. The apparatus of claim 1 wherein the sighting device further includes a second light source. 15. The apparatus of claim 14 wherein each of the first light source and the second light source is selected from the group consisting of: a visible light laser, an infra-red laser, a visible light flashlight, and a visible light laser. 16. The apparatus of claim 1 wherein the sighting device further includes a mechanical sight. 17. The apparatus of claim 1 that includes a first canister and a second canister, wherein the first canister includes the first light source, and the second canister includes one or more of the power source and a second light source. 18. The apparatus of claim 1 that further includes a light source adjustment apparatus. 19. The apparatus of claim 1 wherein the first light source has a first end and a second end, and the light source adjustment apparatus comprises a first elastomeric collar that fits over the first end of the first light source and a second elastomeric collar that fits over the second end of the first light source. 20. The apparatus of claim 19 wherein the sighting device includes (a) a housing that retains the first light source and the light source adjustment apparatus, the housing including one or more apertures, and (b) a set screw received in at least one of the one or more apertures, wherein the first light source is movable by adjusting the set screw. 21. The apparatus of claim 20 wherein the housing has two apertures and a set screw positioned in each aperture, and the light source can be moved by adjusting either of the set screws. 22. The apparatus of claim 16 wherein the mechanical sight includes a sighting insert. 23. The apparatus of claim 22 wherein the sighting insert is luminescent. 24. The apparatus of claim 1 wherein the power source is one or more batteries. 25. The apparatus of claim 1 wherein the power source and the first light source are each above the top surface of the gun. 26. The apparatus of claim 14 wherein each of the first light source and the second light source are above the top surface of the gun. 27. The apparatus of claim 1 wherein the first light source pulses at 1,000 cycles per second. 28. The apparatus of claim 1 wherein the sighting device is between 0.9″ and 2½″ in length. 29. The apparatus of claim 1 wherein the sighting device is less than 3″ in length. 30. The apparatus of claim 1 wherein the sighting device is less than 2″ in length. 31. The sighting device of claim 1 wherein the first light source draws less than 10 milliamps of power when emitting light. 32. The apparatus of claim 27 wherein the first light source has a 50% duty cycle as it pulses. 33. The apparatus of claim 1 wherein the mounting slot has a dove tail shape. 34. The apparatus of claim 14 wherein the first light source and the second light source each emit the same type of light. 35. The apparatus of claim 14 wherein the first light source and the second light source each emit different types of light. 36. The apparatus of claim 1 wherein the sighting device is positioned above the top surface of the gun and extends outward from the top surface by ¾″ or less. 37. The apparatus of claim 1 wherein the sighting device is positioned above the top surface of the gun and extends outward from the top surface by ⅜″ or less. 38. The apparatus of claim 17 wherein the first canister and the second canister are each cylindrical in shape. 39. The apparatus of claim 1 that further includes a first canister and the first light source is in the first canister. 40. The apparatus of claim 39 wherein the power source is in the first canister. 41. The apparatus of claim 1 that includes a first canister and a second canister, the first light source being positioned in the first canister, and a mechanical sight being positioned between the first canister and the second canister.