Kevin McCLOUTsky looks into it for us:

It’s called the Viridian XTL.  Oh man the prosecution LOVES this… but so does the defense so it might work in your favor if you weren’t being a dumbass.  I just don’t want to see anyone appendix carrying commando style with this contraption on their gun.  They should have a warning about that on the website.
If there’s a niche site already dedicated to that, don’t even tell me about it.   Also seeing as it’s 2019 it’s only a matter of time before someone negligently takes a selfie with one of these things.  Yea it seems like common sense, but….

Thoughts?