Wisconsin State Senator Jon Erpenbach (D-27) has introduced Senate Bill 461. This bill contains several provisions pertaining to gun rights in the Badger State including the following:
*Prohibits the manufacture, transportation, sale, possession, and carrying of firearms that cannot be detected by metal detectors or airport x-ray machines or scanners. Federal law currently has a comparable prohibition; under this bill, the person would violate state law as well. A person who violates the state prohibition is guilty of a Class G felony.
*Prohibits the sale, posting, provision, or possession of plans for manufacturing an undetectable firearm. A person who violates the prohibition is guilty of a Class H felony.
*Prohibits the possession of a frame or a receiver of a firearm that is not marked with a serial number. A person who violates the prohibition is guilty of a Class I felony.
Essentially, they are coming after firearms that could be 3D printed or homebuilt and those individuals who manufacture or possess them.