Well, I finally got a hold of MMC and talked to an EXTREMELY helpful and pleasant woman there. She explained to me that the sight vendors can only work on their own tritium tubes ... so while you can send any of them a slide with regular sights to retro-fit with tritium, Trijicon sights need to go back to Trijicon and MMC's need to go back to MMC. She even took the time to explain how to tell where they came from. My slide is now on its way back to Trijicon, but I think that if I add tritium to any existing sights, MMC's great customer service will have won them a customer.
Thanks all!
Saands