I finally got two flashlights that will fit the rings of my double-stack flashlight mount. They're DX jobbies, but they'll do the job. I've had some of their flashlights for years now with no complaints. Only a few of them have crapped out on me, but that was because I was running batteries not recommended by the manufacturer.
Anyway, the double-stack is light, compact and easy to use. The quick-release latch seems sturdy and clamps on tight.