Just what the world needed, an even larger "pistol" round for the AR platform.
Go here to get a look at an AR in .510 Beck.
This makes hunting with a rifle-like gun possible in areas where using a bottleneck cartridge is prohibited.
I'm not sure how those laws are worded so that a .71 slug in a smooth barrel is legal but a .30 bullet in a rifled one is not and somehow a .51 bullet in a rifled barrel with a straight wall cartridge passes muster, but I guess it does. Looks about right for really large game in cluttered areas where those legendary 1000 yard shots simply aren't going to happen.