From Guns.com:

The anti-gun measure, 2020-S 2004B/2020-H 7102Aaa, prohibits anyone from “manufacturing, selling, offering to sell, transferring, purchasing, possessing, or having under his or her control” any firearm that doesn’t have a serial number or is made almost exclusively of plastics or through a 3-D printing process. The bill passed the Rhode Island House of Representatives 61-8 last week after an earlier passage by the state Senate.