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VLTOR E Series Scout Flashlight Mount .810-.826inch
Part No. VLSM-E
I had to remove the tail cap and gently pry the mount open a little with a screw driver. It fits perfectly and the combo is lightweight.
Edit:
I am using a Protac 1L light.
This mount may not work with the Protac 1L-1AA.
If you need me to take some measurements PM me.