Doesn't the law include that devices which fail to implement such checks are barred from sale?

>In addition, knowingly disabling or circumventing the blocking software is a misdemeanor.

The inobvious thing is that that aspect of the law cannot be applied to felons or persons convicted of misdemeanor domestic violence, since like failing to pay the tax stamp on a Class-III firearm or accessory, it would require self-incrimination, which thus far, is still illegal.