I recently acquired an older Glock 19 with an unusual laser sight of which I'm trying to determine the manufacturer. The battery pod is in the backstrap and accessible via a threaded cap just behind the magazine well at the bottom of the grip. The back strap has a red button which is depressed when you hold the Glock for firing to activate I would guess the laser. The laser is integrated into the gun (no external wiring) in a half inch by half inch box mounted on the front of the trigger guard. i was told this might be an earlier model Crimson Trace however the full integration of the unit doesn't appear to parallel the designs used for recent units from that company. Any help would be much appreciated.