Let's talk about the Streamlight Protac Rail Mount 2.  Normally I'm a big fan of Streamlight, but this time I have a problem with them.  While the flashlight itself is solid, the remote switch is using a poor design.  On top of that there is no instructions in the box on how to put it on.

Here is the video I used to install this:
ProTac 2.0 Rail Mount HP | Installation an...

Video I did on the other flashlight that's also in this video:
Can This $30 Amazon Flashlight Be As Good ...