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An accessory device for being mounted to a longitudinal rail carried by a firearm and accommodating longitudinal rails of different configurations. A preferred embodiment comprises a light beam generator including a housing, elongate members removably secured to the housing and complementing the rai

An accessory device for being mounted to a longitudinal rail carried by a firearm and accommodating longitudinal rails of different configurations. A preferred embodiment comprises a light beam generator including a housing, elongate members removably secured to the housing and complementing the rail for enabling the housing to be retainably slid along the rail, a latch plate pivotally and removably secured to the rail, and a replaceable ambidextrous tail cap switch.

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I claim: 1. An accessory device for a firearm including a frame, a longitudinal barrel, a longitudinal rail carried by the frame, and a depression in the rail, the accessory device comprising: a housing; elongate members removably secured to said housing, said elongate members complementing the rai

I claim: 1. An accessory device for a firearm including a frame, a longitudinal barrel, a longitudinal rail carried by the frame, and a depression in the rail, the accessory device comprising: a housing; elongate members removably secured to said housing, said elongate members complementing the rail for enabling said housing to be retainably slid along the rail; and a plate pivotally secured to said housing about a transverse axis and having a free end biased away from said housing, said plate including a protuberance in the vicinity of said free end, said protuberance receivable by the depression for stopping sliding of said housing along the rail. 2. The accessory device according to claim 1, wherein: said plate is removable from said housing. 3. The accessory device according to claim 1, including: a light emitter assembly carried by said housing; a battery carried by said housing in circuit for energizing said light emitter assembly when switch actuated; and a switch device including a switch actuator for said battery. 4. The accessory device according to claim 3, wherein: said switch device is removably secured to said housing. 5. The accessory device according to claim 2, wherein: said plate is captured to said housing by said elongate members secured to said housing, and said plate is removable from said housing when said elongate members are removed from said housing. 6. The accessory according to claim 5, wherein: said plate is removable from its securement about said transverse axis when said elongate members are removed from said housing. 7. The accessory device according to claim 2, wherein: said plate includes transversely extending arms through said housing, said arms captured to said housing by said elongate members secured to said housing. 8. The accessory device according to claim 7, wherein: said arms are adapted to be urged by an operator for pivoting said plate about said transverse axis toward said housing. 9. The accessory device according to claim 7, wherein: said housing is adapted for releasing said arms from capture to said housing when said elongate members are removed from said housing. 10. The accessory device according to claim 9, wherein: said plate is adapted for being removed from its securement about said transverse axis when said arms are released from capture to said housing. 11. The accessory device according to claim 3, wherein: said switch actuator is rotatably urgeable by either hand of an operator when said housing is installed on the rail for placing said switch device in a CONSTANT ON or OFF position, and forwardly urgeable by either hand of the operator when said housing is installed on the rail for placing said switch device in a MOMENTARY ON position. 12. The accessory device according to claim 11, including: a remote switch actuator communicating with said switch device for remotely actuating said switch device to a MOMENTARY ON position. 13. The accessory device according to claim 3, wherein: said switch device comprises a tail cap switch pivotally secured to said housing about a pivot axis, said tail cap switch pivotable about said pivot axis away from said housing. 14. The accessory device according to claim 13, wherein: said pivot axis is coincident with said transverse axis. 15. The accessory device according to claim 13, wherein: said tail cap switch is adapted for being removed by an operator from its securement about said pivot axis. 16. The accessory device according to claim 13, wherein: said tail cap switch is adapted for being removed by an operator from its securement about said pivot axis only when said tail cap switch is pivoted away from said housing. 17. The accessory device according to claim 13, wherein: said tail cap switch includes a switch actuator rotatably urgeable by either hand of an operator when said housing is installed on the rail for placing said tail cap switch in a CONSTANT ON or OFF position, and axially urgeable by either hand of the operator when said housing is installed on the rail for placing said tail cap switch in a MOMENTARY ON position. 18. The accessory device according to claim 17, including: a remote switch actuator communicating with said tail cap switch and operable by either hand of the operator for placing said tail cap switch in a MOMENTARY ON position. 19. The accessory device according to claim 3, wherein: said switch device comprises a tail cap switch and said switch actuator includes an actuator arm rotable at its center about a longitudinal axis of said housing, said actuator arm including longitudinally displaceable ends with handles at said ends, one of said handles accessible to one hand of the operator and the other of said handles accessible to the other hand of the operator when said housing is installed on the rail; said switch actuator is adapted for placing said tail cap switch in a CONSTANT ON position when either of said handles is upwardly or downwardly urged by the operator from an OFF position of said switch, and for returning said tail cap switch to the OFF position upon reverse urging of either of said handles; and said switch actuator is adapted for placing said switch in a MOMENTARY ON position when either of said handles is forwardly urged from the OFF position by the operator. 20. The accessory device according to claim 19, wherein: said switch actuator is latched in the OFF position when said actuator arm is transversely oriented, and said switch actuator is latched in the CONSTANT ON position when said actuator arm is rotationally displaced from its transverse orientation. 21. The accessory device according to claim 19, wherein: said tail cap switch is pivotally secured to said housing about a pivot axis. 22. The accessory device according to claim 21, wherein: said tail cap switch is adapted for being removed by an operator from its securement about said pivot axis. 23. The accessory device according to claim 1, wherein: the securement of said elongate members is transversely adjustable. 24. The accessory device according to claim 1, wherein: said elongate members are secured to said housing with headed screws retained in bores in said elongate members respectively communicating with threaded bores in said housing, said bores in said elongate members providing a loose fit with said headed screws at least in the transverse direction for adjusting the transverse distance between said members. 25. A method of assembling an accessory device for installation on a rail having a depression and carried by a firearm, comprising: providing the accessory device including a housing; providing elongate members complementing the rail; providing a plate having a protuberance in the vicinity of an end thereof, said protuberance sized for being received by the depression in the rail; pivotally securing said plate to said housing with said end biased away from said housing; and removably securing said elongate members to said housing with said elongate members capturing said plate to said housing and enabling said housing to be retainably slid along the rail. 26. The method according to claim 25, further including: sliding said housing along the rail until said protuberance of said biased plate is received by the depression. 27. The method according to claim 25, wherein: in the plate providing step, said plate is removably securable to said housing about a transverse axis. 28. The method according to claim 25 wherein the rail is a first rail, further including: removing said elongate members from said housing; removing said plate from said housing; providing a second plate having a protuberance in the vicinity of an end thereof, said protuberance of said second plate sized for being received by a depression in a second rail carried by a firearm; pivotally securing said second plate to said housing with said end thereof biased away from said housing; and removably securing said elongate members to said housing with said elongate members capturing said second plate to said housing and enabling said housing to be retainably slid along the second rail. 29. The method according to claim 28, wherein: in the second plate providing step, said protuberance of said second plate is of a different size than said protuberance of said first plate. 30. A method of adapting an accessory device normally installable on a first rail carried by a firearm and having a depression, for installation on a second rail carried by a firearm and having a depression of a different size than the depression in the first rail, comprising: providing the accessory device including a housing, a first plate having a a protuberance in the vicinity of an end thereof, said protuberance of said first plate sized for being received by the depression in the first rail, said plate being removably pivotally secured to said housing along a transverse axis with said end thereof biased away from said housing, and elongate members complementing the first rail and removably secured to said housing and capturing said plate to said housing, said elongate members enabling said housing to be retainably slid along the first rail; removing said elongate members from said housing; removing said first plate from said housing; providing a second plate having a protuberance in the vicinity of an end thereof sized for being received by the depression in the second rail; removably pivotally securing said second plate to said housing along a transverse axis with said end of said second plate biased away from said housing; and removably securing elongate members complementing the second rail to said housing and capturing said second plate to said housing and enabling said housing to be retainably slid along the second rail. 31. The method according to claim 30, further including: sliding said housing along the second rail until said protuberance of said second plate is received by the depression in the second rail. 32. The method according to claim 30, wherein: in the elongate members securing step, the elongate members being secured are the same elongate members removed in the elongate members removing step.