Prohibit the sale and possession of ghost guns

SF 3661 prohibits the sale and possession of "ghost guns" - unserialized firearms made via 3D printing or lacking serial numbers - and requires all firearms to have unique serial numbers engraved on the frame or receiver. It gives current owners of unserialized firearms 180 days to add a serial number (via a federal licensee), destroy the firearm, remove it from the state, or surrender it to law enforcement. The law specifically targets DIY firearms that evade standard tracking, affecting residents who own such unserialized weapons or unfinished frames. It also bans distribution of 3D-printer firearm design files and requires public safety officials to issue notices about the new rules.