A gunfire effect for a cosplay prop works good so far.
Might be cool to see a slower (but not too slow) color fade up (blue? red?) then a quick bright flash of another color.
Nice mock up work!
Hadn’t thought about using foam for that before. Great idea.
Thanks the idea with the blue might look pretty nice I’ll give it a try 
This foam is actually really usefull for cosplay this one is called eva strong and really sturdy. Pretty good to work with.