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Sidearms & Scatterguns Laser/light combo

I don't think there is a well made good option currently. Surefire will be releasing an XC2 sooner or later. It has a light and laser. Personally I'm not fan of the way the XC1/XC2 operate, but you may be. Check it out.
IMO you would be better served getting one of the new Inforce APL compacts, fits perfectly on the G19, and a Lazermax guide rod laser. I have a few they do work.