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I think you will only have a couple options for this. Either try the recover system for the beretta 92, or nc star makes a rail system that connects to the front portion of the trigger guard. I'll attach a link of the RECOVER set up. https://www.recovertactical.com/products/bc2-beretta-grip-rail-system-for-the-beretta-92-m9?variant=18662328007 Not sure if something like this is what your looking for, but seems like it would be an option.
Several companies make/sell Universal laser sights that mount on the front of the trigger guard. An example can be found at http://www.lasersightpro.com/store-products-NCS-ATPLS-TRIGGER-GUARD-MOUNTED-UNIVESAL-RED-LASERSIGHT_1097784171.html Internal lasers are also available. An example of this type can be seen at http://www.lasersightpro.com/store-products-LMX1441T-Lasermax-Laser-Sight-for-Taurus-PT92-PT99-PT100-PT101-Beretta-92-92FS-96-Vertec_1097358379.html Many others can be found by using google. Good luck in your search.