Surefire "P" Series Product History

[Tempest UK]

I was wondering if any of the Surefire gurus out there could provide me with a product history of the "P" series of lights? 6P, 9P, 3P etc. I'm after the changes made to the different models over time (anti-roll bezel etc) and if possible when these changes were made, when each model was introduced and such. Also any information on the "special" editions of the lights, such as the Patriotic Spirit, would be great.

This is all so I can collect as much information as I can to start a collection of these lights (if this means it should go in flashlight collecting then could someone kindly move it for me? ).

Thanks for your help
Regards,
Tempest