I wasn't happy with the light system I used in post #3512, so I recently did this:
Surefire M600U Scout Light (1000 lumens), Surefire Rail Mount Tape Switch Model SRXX, Magpul M-LOK Extended Cantilever Scout Mount, Impact Weapons Components MOUNT-N-SLOT Direct Attach Mount.
(Keep in mind that I'm a left handed shooter.)
Left side:
Attachment 58333
From the bottom:
Right side:
Switch was mounted to a nine slot section of M1913 rail held to the handguard with M-LOK.
The light sits back from the muzzle ~2". The center of the light to the center of the muzzle is also ~2".
This is the shadow it creates 2' from the wall:
Haven't shot with it yet, but with a little bit of dry fire/handling in the basement I like it better now.
I may need to add some wire ties to the cable to help keep it in place.