1KPerDay
Member
I wasn't going to ask what the heck is the deal but I found this link.... for anyone interested this article is a good read and clears it up.
https://www.americanrifleman.org/articles/2012/11/5/shades-of-gray-300-whisper-300-aac-blackout/
https://www.americanrifleman.org/articles/2012/11/5/shades-of-gray-300-whisper-300-aac-blackout/