Here’s something. It’s not the best execution of a PDW, but it does chamber a really neat cartridge - the 7/92x24VBR. It’s a 30 carbine with a shorter case and almost zero taper. Same ME as a 9mm, 450ft*lbs IIRC. It’s what 30 Super Carry should have been. I will post 2 images of the chambering in subsequent posts.