Sen. Dianne Feinstein introduced legislation written to close what she labels an “automatic weapons loophole,” where devices allow semi-automatic firearms to be operated with rates of fire approaching those of actual machine guns. The “Automatic Gunfire Prevention Act” is modeled after existing California law that classifies semi-automatic weapons outfitted with bumpfire stocks as machine guns.
Feinstein included a similar provision effectively banning bumpfire stocks in her 2013 “assault weapons bill,” though this act is solely focused on devices that help shooters to increase their rates of fire on semiautomatic firearms.
From the bill:
“…it shall be unlawful for any person to import, sell, manufacture, transfer, or posses… a trigger crank, a bump-fire device, or any part, combination of parts, component, device, attachment, or accessory that is designed or functions to accelerate the rate of fire of a semi-automatic rifle but not convert the semiautomatic rifle into a machinegun.”
Two things of note: first, there are no grandfather provisions for devices legally purchased and currently owned; second, binary triggers are not mentioned specifically, but they will likely fall under the general prohibition on devices that are designed to accelerate rate of fire. In short, just because you own these now doesn’t mean you’ll be able to keep them, and any rush on the purchase of these devices at what will certainly become extremely elevated market prices may be expensive foley.
The Automatic Gunfire Prevention Act is only two short pages and can be read in its entirety here: https://goo.gl/qixEsP