aginthelaw
Flashlight Enthusiast
Head looks too wide to be a Streamlight SL-20. Plus, it has outward grooves on the bezel. Not an SL-20.
It looks as though the entire body and bezel is rubberized. From the square checkering on the barrel and the lanyard-pull, it might be a cheap, generic, 2D, floating flashlight that was converted to put out more light just for the film. (Wouldn't be the first time that's been done. There's also the possibility that it really is a SureFire M6, with a rubber sleeve over the barrel and another one over to bezel. This would be done if the film's producers didn't obtain permission from SureFire to display a stock M6 in the film. (Also wouldn't be the first time that's been done either. And specifically with an M6.)
...and just how would you know it's been converted for the movie? hmmmm? is there something you're not telling us?