The M3/M6 family of lights do not naturally fit the SC. They will fit on the rail, but are not retained. The reason for this is that the retention bar is mounted on the front of the light rail, where it lines up with most duty-size pistol rails. I took mine apart last night, thinking of this same thing. Perhaps a little time designing and a little time with a dremel and a drill press will be able to solve this. The retention bar needs to be moved back a bit for the sub. If this was done, then it would not fit on the 4" and 5" models.... without a little modification to the rail. I apologize for the long-windedness, I was just thinking about this last night.... Of course, I just got a Surefire E2E, so I won't be needing a tac light on my sub.... but I digress.
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