I'm going to get a Fenix TK15 for the AR here next week. Going to mount it by using a aluminum KZ mount. I would go for something like that.
Did pretty much the same thing except I mounted a picatinny rail to the bottom of the handguard and used a Surefire G2 with a pressure switch. Used some Warne rings I had in the box. I think they now sell handguards with rails on the side and bottom for Mossys and Remmys. It's taken 40-50 magnum practice rounds at the range thus far.Surefire 6P
Surefire 1" flashlight mount to standard rails
Barrel mount that adds a 3 inch picatiney rail