Please poke holes in my idea, this was something that occurred to me the other day and I don't know if it's dumb or not.
The purpose of gun control is (supposedly) to limit more dangerous guns but still let people have self-protection. The move to ban SBR's and suppressors was both pushed due to the fear that they could be used by criminals more easily. Today, that is not a serious consideration. Currently one of the bigger pushes is for smaller calibers ("para bellum literally means for war!") because they are less damaging. Interestingly, two things which reduce the muzzle velocity of a bullet are shorter barrels and suppressors.
If you want to make guns less dangerous then flip the laws. Require suppressors and make a barrel over 14" require a tax stamp.
Of course, this is all predicated on the idea that they are being honest about their motivations. I know.