Picatinny rail flashlight mount for Cree mini flashlight. Everything is friction set, no tools needed! It holds your weapon and light together very well, no rattling or movement.

http://www.amazon.com/gp/product/B006E0QAFY?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00

It would work for other flashlights as well, the diameter of the Cree mini is ~20mm. You can scale the ring for your needs.