Here, although if it was me, I'd sell the underwhelmed 300 AAC and replace it with a 5.56 fast twist shooting heavy frangibles or a properly setup Mossberg 930/940. That is what makes America, Merica, people doing what they want with what they want.
Gorilla 300 AACDarryle, I also have a 5.56 upper for the same pistol, so that option is already a reality. But my focus is still to build a capable CQB platform that can be used in a pinch without ears.
FYI - I did buy some Gorilla Silverback, 300 BLK 205gr, Self Defense & Hunting Subsonic Ammunition to try. Limited range time had me try just 3 rounds at 25 yards and one of those key-holed?! So, I will test the next time without my precious suppressor on as I do not want to risk damaging it. Heavier loads from other manufacturers showed no such tendency, but these Gorilla rounds appear pretty long for caliber.