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A dot sighting device includes a housing, a light source, a beam splitter and a reflective element. The housing has a first opening and a second opening. A first axis is defined from the first opening to the second opening. The light source emits light. The beam splitter includes a surface that refl

A dot sighting device includes a housing, a light source, a beam splitter and a reflective element. The housing has a first opening and a second opening. A first axis is defined from the first opening to the second opening. The light source emits light. The beam splitter includes a surface that reflects at least a portion of a first light component and transmits at least a portion of a second light component. The second light component is defined as light that enters the housing through the first opening.

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1. A dot sighting device, comprising: a housing having a first opening and a second opening, a first axis being defined from a center of the first opening to a center of the second opening, and a second axis being defined normal to the first axis;a light source that emits light;a reflective element

1. A dot sighting device, comprising: a housing having a first opening and a second opening, a first axis being defined from a center of the first opening to a center of the second opening, and a second axis being defined normal to the first axis;a light source that emits light;a reflective element that reflects at least a portion of the light incident on the reflective element, a first light component being defined as the reflected light, and the reflective element being disposed on the second axis;a beam splitter that includes a surface that reflects at least a portion of the first light component and transmits at least a second light component, the second light component being defined as ambient light that enters the housing through the first opening, passes through the beam splitter, and exits the housing through the second opening; anda light-reducing optical element disposed on the first axis and configured to limit transmission of the first light component. 2. The dot sighting device of claim 1, further comprising a mounting portion operable to couple the housing to a firearm, whereinthe mounting portion is disposed at a first side of the housing, andthe reflective element is disposed at a second side of the housing. 3. The dot sighting device of claim 2, wherein the first side of the housing is opposite to the second side of the housing. 4. The dot sighting device of claim 1, wherein the beam splitter includes a first face having an antireflective treatment. 5. The dot sighting device of claim 4, wherein the first face is disposed on the second axis. 6. The dot sighting device of claim 4, wherein, a third axis is defined normal to the first axis and normal to the second axis, andthe first face is disposed on the third axis. 7. The dot sighting device of claim 4, wherein the light source is operable to emit light that is incident upon the first face, anda portion of the first face where the light from the light source is incident does not include the antireflective treatment. 8. The dot sighting device of claim 4, wherein the antireflective treatment includes at least one of an antireflective film and an irregular portion. 9. A dot sighting device, comprising: a housing having a first opening and a second opening, a first axis being defined from a center of the first opening to a center of the second opening, and a second axis being defined normal to the first axis;a light source that emits light;a reflective element that reflects at least a portion of the light incident on the reflective element, a first light component being defined as the reflected light, and the reflective element being disposed on the second axis;a beam splitter that includes a surface that reflects at least a portion of the first light component and transmits at least a portion of a second light component, the second light component being defined as light that enters the housing through the first opening, the beam splitter including a first face having an antireflective treatment; anda light-reducing optical element disposed on the first axis and configured to limit transmission of the first light component, whereinthe beam splitter includes a second face upon which the second light component is incident, andthe antireflective treatment includes a portion of the first face having a surface that is rougher than a surface of the second face. 10. The dot sighting device of claim 4, wherein the antireflective treatment reduces or prevents total internal reflection of light that enters the beam splitter and is incident on treated portions of the first face. 11. A dot sighting device, comprising: a housing having a first opening and a second opening, a first axis being defined from a center of the first opening to a center of the second opening;a light source that emits light;a beam splitter that includes a surface that reflects or transmits at least a portion of a first light component of the light and transmits, the beam splitter including a first face having an antireflective treatment;a reflective element that reflects at least a portion of the first light component reflected or transmitted by the surface of the beam splitter toward the beam splitter, and that transmits the second light component; anda light-reducing optical element disposed on the first axis and configured to limit transmission of the first light component, whereinthe second light component is defined as ambient light that enters the housing through the first opening, passes through the beam splitter, and exits the housing through the second opening. 12. The dot sighting device of claim 11, wherein a second axis is defined as normal to the first axis, andthe first face is disposed on the second axis. 13. The dot sighting device of claim 11, wherein the light source is operable to emit light that is incident upon the first face, anda portion of the first face where the light from the light source is incident does not include the antireflective treatment. 14. The dot sighting device of claim 11, wherein the antireflective treatment includes at least one of an antireflective film and an irregular portion. 15. A dot sighting device, comprising: a housing having a first opening and a second opening, a first axis being defined from a center of the first opening to a center of the second opening;a light source that emits light;a beam splitter that includes a surface that reflects or transmits at least a portion of a first light component of the light and transmits at least a portion of a second light component, the second light component being defined as light that enters the housing through the first opening, the beam splitter including a first face having an antireflective treatment;a reflective element that reflects at least a portion of the first light component reflected or transmitted by the surface of the beam splitter toward the beam splitter, and that transmits the second light component; anda light-reducing optical element disposed on the first axis and configured to limit transmission of the first light component, whereinthe beam splitter includes a second face upon which the second light component is incident, andthe antireflective treatment includes a portion of the first face having a surface that is rougher than a surface of the second face. 16. The dot sighting device of claim 11, wherein the antireflective treatment reduces or prevents total internal reflection of light that enters the beam splitting cube and is incident on treated portions of the first face. 17. The dot sighting device of claim 11, wherein, a second axis is defined as normal to the first axes, andthe reflective element is disposed on the second axis. 18. The dot sighting device of claim 17, wherein the first face is disposed on the second axis. 19. The dot sighting device of claim 17, further comprising a mounting portion operable to couple the housing to a firearm, whereinthe mounting portion is disposed at a first side of the housing, andthe reflective element is disposed at a second side of the housing. 20. The dot sighting device of claim 19, wherein the first side of the housing is opposite to the second side of the housing. 21. A dot sighting device, comprising: a housing having a first opening and a second opening, a first axis being defined from a center of the first opening to a center of the second opening;a light source that emits light;a reflective element;a beam splitter that includes a surface that reflects or transmits at least a portion of the light emitted from the light source to be directed toward the reflective element, the beam splitter including a first face having an antireflective treatment; anda light-reducing optical element disposed on the first axis and configured to limit transmission of the light emitted by the light source, whereinthe reflective element reflects at least a portion of the light reflected or transmitted by the beam splitter to form an image, andthe housing and beam splitter are arranged such that an ambient light component enters the housing through the first opening, passes through the beam splitter, and exits the housing through the second opening. 22. The dot sighting device of claim 21, wherein the first face is disposed to be adjacent to the reflective element. 23. The dot sighting device of claim 21, wherein the light source is operable to emit light that is incident upon the first face, anda portion of the first face where the light from the light source is incident does not include the antireflective treatment. 24. The dot sighting device of claim 21, wherein the antireflective treatment includes at least one of an antireflective film and an irregular portion. 25. A dot sighting device, comprising: a light source that emits light;a reflective element;a beam splitter that includes a surface that reflects or transmits at least a portion of the light emitted from the light source to be directed toward the reflective element, the beam splitter including a first face having an antireflective treatment; anda light-reducing optical element configured to limit transmission of the light emitted by the light source, whereinthe reflective element reflects at least a portion of the light reflected or transmitted by the beam splitter to form an image,the beam splitter includes a second face upon which external light that enters the dot sighting device from an outside is incident,the antireflective treatment includes a portion of the first face having a surface that is rougher than a surface of the second face,the beam splitter is arranged between the light source and the reflective element along a first axis, the first axis including a center of a first face of the beam splitter and a center of a second face of the beam splitter, andthe light-reducing optical element is disposed on a second axis orthogonal to the first axis. 26. The dot sighting device of claim 21, wherein the antireflective treatment reduces or prevents total internal reflection of light that enters the beam splitter and is incident on treated portions of the first face. 27. The dot sighting device of claim 1, wherein the light-reducing optical element includes a polarizer. 28. The dot sighting device of claim 1, wherein the light-reducing optical element is distinct from the beam splitter. 29. The dot sighting device of claim 28, wherein the light-reducing optical element is disposed a distance away from the beam splitter. 30. The dot sighting device of claim 1, wherein the light-reducing optical element substantially blocks the first light component.