Chrysalis

This movie, Chrysalis, it... well...

Clearly these are painted muzzle flashes.

Anyway, they did kind of a neat thing with muzzle flashes. They actually created "streaks" (presumably from the bullets) which swooshed by the frame. Faster than Star Wars blaster "rays" but obviously absurd from a "real" standpoint. I kind of dig them.

Here you can see a "streak" going by in the right center of the frame.

 Have I mentioned the WE "G39", which is their version of an HK G36?