If a Blackout has any flash, I would like an opportunity to look into it. There are rifles with different thread lengths and we make various Blackout models - generally designed for an actual M4 but we have other fits also.
As for how to photograph flash, I use a 1 or 2 second shutter speed to ensure that the entire event is captured. I then sum the raw image brightness.
I like his testing as he contributes so much more than, say, a gun magazine.

