When you say a regulated driver do you mean 7135s or something else? the used m1 dropped to $13.99 so i snagged it up, it has a xml-2 and 8*7135 in neutral white (T6 3B) and came with 3 filters in red, green, and blue. I plan on keeping it stock for now if its good enough but with how cheap it was eventually modding it isn't out of the question. Plus i like how it looks and wanted to get another flashlight