I was looking at those. 40-50 bucks just for a filter. I ended up buying a kdlitker red drop in on kaidomain. Maybe it'll suck, maybe it won't, but it was $11Easiest solution: Find a red filter that fits over the top of the bezel. Just need to find the right size. Old School SureFire 6P red cover would work. But folks want insane prices for an Original.