Hi Shooter21 :welcome:
The mount in the link is for a 1" diameter body flashlight and is a little too large for the P20C2. You would have to make a spacer to use it.
The new Viking Tactics flashlight mount would work with the supplied spacer that was intended for the Surefire E series.
Here's the link: http://tbflashlights.com/products/Viking-Tactics-Flashlight-Rail-Mount.html#
If you can be a little more specific about the rifle and application I'm sure you'll get lots of suggestions from the community here.