The laser itself is the piece mounted in front of the accessory rail... It's electronics are under the hand grip... battery under the right hand grip.. also in the left hand grip is a micro switch. So when you squeeze the grips like you are ready to shoot, the laser comes on.
The laser is mounted in these photos with hi-temp hot glue, and has not come loose or lost adjustment after 50 rounds(And MANY trips in and out of my holster). The hot glue REALLY(I mean REALLY) sticks to the polymer frame if you use sandpaper to take the gloss off the polymer first.
The laser is going to be mounted with JB Weld now that I have had time to test the system and determine how many yards out I want it sited in at. Plus, the JB is black in color and will conceal the already TINY laser apparatus almost completely.
I started the idea with a bunch of laser pointers laying around...I tested them all with fresh batteries, and then picked the one that had the brightest, best shaped, dot on the wall at 50 yards. I then pulled it apart, un-soldered the laser from the PCB, and started on the custom wiring. Only had to drill two TINY holes in the frame for the wiring to cross between the mag well.
Here are some pics WITHOUT my flashlight on the gun...