Under a new California law, “firearm precursor parts” must be sold through a “licensed firearm precursor part vendor.”
(a) As used in this part, “firearm precursor part” means a component of a firearm that is necessary to build or assemble a firearm and is described in either of the following categories:
(1) An unfinished receiver, including both a single part receiver and a multiple part receiver, such as a receiver in an AR-10- or AR-15-style firearm. An unfinished receiver includes a receiver tube, a molded or shaped polymer frame or receiver, a metallic casting, a metallic forging, and a receiver flat, such as a Kalashnikov-style weapons system, Kalashnikov-style receiver channel, or a Browning-style receiver side plate.
(2) An unfinished handgun frame.
Here’s a receiver tube. It is simply an 18-inch piece of 1 1/2” steel tube. This one is marked for finishing, but finishing is not required to make the tube into a precursor part. The tube is a component necessary to build or a…