Do AR pistols comply?
No stock at all. SIG has a nice brace for it, tho. Ten round mag. Short pistol barrel. It's a pistol, not an "assault" rifle.
Anyone remember when "switchblades" were made illegal in the early '60s? Well, the real offenders just moved up to handguns, the unintentional consequence. The knife industry took a pause, then Spyderco came out with the hole in the blade. Others were already retailing clamp on thumb studs, and America's most popular knife, the Buck, got a quick deploy sheath.
Today, we just don't wait around for innovation, we work at it. Give the American entrepreneur an obstacle, he sees a marketing opportunity.
How does the SAFE act view guns with two magazines? Frankly, inventors and gunsmiths are going to go out of their way to come up with new interpretations on the laws unspecified aspects and force legislators to keep confronting the hasty measure.
This isn't a disaster, it's an exercise in educating politicians, and if we rub their nose in it long enough, they will get tired of it. They can be made to look like fools, and even the citizens who don't care either way about guns will note it.