A few years ago Larue Tactical made an offset Scout light mount. There are tens of thousands of Surefire Scout's in service but oddly, only Larue makes a replacement mount for the thumb screw and it's no offset from the rail any longer.
For a while, guys wishing to bolt them onto HK416s at an offset angle have been screwing them to the handguard. Works like a champ, but positioning and battery changes become an issue then. Not anymore. We have modified the E-Series design to accept the Scout light, both the 3V and 6V versions. Seen here on the 10" 416 and KAC SR15 E3.