I'm not sure if it will fit the Surefire holster but I would bet the bank that it would fit in a Blackhawk mod-u-lok holster bezel down. My EagleTac T10LC2 is a perfect fit, bezel down, in the mod-u-lok and I believe they have the same diameter head / bezel. They are both quality holsters I just like the ease of the mod-u-lok vs Surefire and it also doesn't scratch, dent, or mar the finish on your light like the Surefire.