[sgtsandman]

The general gist is that any mechanical, power-driven, or electronic device that materially increases the rate of the firearm or approximates the action or rate of fire of a machine gun and any device, part, or combination of parts, that is designed and functions to materially increase the rate of fire of the firearm by eliminating the need of the operator of the firearm to make a separate movement for each individual function of the trigger.

Except for the importation for, manufacture for, sale to, transfer to, or possession by or under authority of the United States or any department or agency thereof, or a State or a department, agency, or political subdivision thereof, no later than 120 days after the date of enactment, any person who lawfully owns or possesses a semiautomatic firearm that was modified as described before such date of enactment shall register the semiautomatic firearm in accordance with section 5841 of the Internal Revenue Code of 1986.

So basically, if you already own a firearm with such a device, it will become an NFA item and must be registered as such.

Personally, I think such devices are more of a range toy and are a waste of money and ammunition; however with that being said, lawful firearms owners have already compromised enough and this needs to be fought tooth and nail since it will be yet another cut in the "death by 1,000 cuts on our Constitutional rights.

Here is a direct link to the bill so you can read the entire text: https://www.congress.gov/bill/115th-cong...%5D%7D&r=1