Reflex sight having modular hood

1. A reflex sight system for a firearm, comprising:

a reflex sight having a gun-mounting interface, the reflex sight also including a power supply, a target light generator, and a light-passing surface through which the target light passes between the target light generator and a target;

a reflex sight base portion of the reflex sight including a slot or groove in a forward portion; and

a shroud including a mounting bar structured to engage with the slot or groove of the reflex sight base portion, in which the shroud is detachably removable from the reflex sight base portion.

2. The reflex sight system according to claim 1 , in which, in a fully closed position in which the shroud covers the light-passing surface of the reflex sight, the shroud is fastened to the base portion of the reflex sight.

3. The reflex sight system according to claim 2 , in which the shroud is fastened to the reflex sight base portion with a screw or pin.

4. The reflex sight system according to claim 2 , in which the shroud is flexible and includes one or more projections, and in which the shroud is fastened to the reflex sight by a snapover connection to the reflex sight base portion where the one or more projections of the shroud interface with one or more recesses formed in the reflex sight base portion.

5. The reflex sight system according to claim 1 , in which the shroud is structured to block light from entering the reflex sight.

6. A reflex sight system for a firearm, comprising:

a reflex sight having a gun-mounting interface, the reflex sight also including a power supply, a target light generator, and a light-passing surface through which the target light passes between the target light generator and a target;

a rear window detachably removable from the reflex sight; and

a shroud detachably removable from the reflex sight and structured to cover the reflex sight and the rear window.

7. The reflex sight system according to claim 6 in which the rear window comprises a sealing gasket structured to interface with the reflex sight.

8. The reflex sight system according to claim 6 in which installing the rear window on the reflex sight converts the reflex sight system from an open reflex sight to a closed reflex sight.

9. The reflex sight system according to claim 6 , in which the reflex sight includes a slot or groove in a forward portion, and in which a forward portion of the shroud includes a bar structured to engage with the slot or groove of the reflex sight and rotates relative to the reflex sight during installation.

10. The reflex sight system according to claim 9 , in which, in a fully closed position in which the shroud covers the light-passing surface of the reflex sight, the shroud is fastened to the reflex sight.

11. The reflex sight system according to claim 10 , in which the shroud is fastened to the reflex sight with a screw or pin.

12. The reflex sight system according to claim 10 , in which the shroud is flexible and includes one or more projections, and in which the shroud is fastened to the reflex sight by a snapover connection to the reflex sight where the one or more projections of the shroud interface with one or more recesses formed in the reflex sight.

13. A method of converting an open reflex sight of a firearm to a closed reflex sight, the method comprising:

mounting a rear-window structure to a base portion of the open reflex sight, the rear-window structure including a gasket to seal the rear-window structure to a portion of the open reflex sight;

mounting a shroud over the combination of the open reflex sight and the rear-window structure; and

securing the shroud to the base portion of the open reflex sight to cover the open reflex sight and the rear-window structure.

14. The method according to claim 13 in which mounting a shroud over the combination of the open reflex sight and the rear-window structure comprises:

aligning a bar located in a forward portion of the shroud with a slot or groove in a forward portion of the open reflex sight to engage the bar of the shroud with the slot or groove of the open reflex sight; and

rotating the shroud relative to the reflex sight toward the base portion of the open reflex sight to a closed position.

15. The method according to claim 13 in which securing the shroud to the base portion of the open reflex sight comprises fastening the shroud to the base portion of the open reflex sight with a screw or pin.

16. The method according to claim 13 in which securing the shroud to the base portion of the open reflex sight comprises flexing a portion of the shroud that includes one or more projections over a main portion of the reflex sight and interfacing the one or more projections of the shroud with one or more recesses formed in the reflex sight.