Recon Jack,
I don't think that the nitrolon lights will work in the SureFire mounts, as most were designed for the 6P light. I
think that the nitrolon body is just a tad wider (due to the surface texture) than the 6P (BUT I CAN NOT SWEAR TO THAT!) . If it is wider, then the standard clamp type SureFire mounts probably won't work for the Nitrolon.
If you are trying to go with a move between guns light, I might suggest the Stream Light M-3 series.
they will fit to glock type rails, and Stream Light makes shotgun mounts for Rem and Mossberg shotgun mag tubes (it is a plate type adaptor mount that fits at the end of the mag tube and is secured with either the mag extension or the screw off type magazine end cap. Of course you have a bunch of surefires so you may not want to buy another light system...
I have looked over several of my surefire catalogs (present and past!) looking for the mount you discribed, but I don't see anything in the current catalog like that.
In the oldest catalog I still have ('98) listed a M17 mount that would fit on on a 1" diameter tube with a open area to secure the light. That is a one piece unit, but you couldn't drop the light out to move it to another gun.
That catalog also shows a M12 and M35 base that fits to a 1" diameter tube. those end with a weaver trype base so you could match it to a M10 or M45 weaver type base that holds the light. That way to can seperate the light from the gun mounted base. and move a light between guns.
Not 100% sure if this is what you are looking for, but I hope it provides something useful for you!
If you want, I could scan the mounts page from the old catalog and you could see if what they were selling was what you wanted. E-mail me if you need it! As the Where to find N.O.S. on these mounts would be a question I don't know, but half the battle is knowing WHAT it is that you are looking for!
Might want to call SureFire at 800-828-8809 to see what they can tell you!
Hope this Helps You Buddy!
BIGGER_HAMMER