I have a G&G 416, but had to change the flashhider so I could use my Acetech Predator QD tracer. You can buy the the Acetech tracer unit without the silencer shroud...maybe that might fit in a Delta's suppressor?
The flash hider looks like a copy of the surefire but I don't think there's a can that fits straight on, shame really as TM missed a trick there, they did one for the devgru but as there wasnt one on the source picture i guess they didnt bother ?
There's plenty of cans out there for surefire flash hiders (most of which come with their own flash hider). Pick one that will fit an Acetech unit internally and you're golden!