CMMG Receiver Extension Nut (Castle Nut)

(A) Manufacturing more than three firearms per calendar year in California.

(B) Manufacturing a firearm using a three-dimensional printer or CNC milling machine.

(C) Manufacturing a firearm for the purpose of selling or transferring ownership of that firearm to another individual who is not licensed to manufacture firearms.

(D) Manufacturing a firearm for the purpose of selling, loaning, or transferring that firearm, with the intent to complete the sale, loan, or transfer without a required background check initiated by a licensed firearms dealer.

(E) Allowing, facilitating, aiding, or abetting the manufacture of a firearm by a person who is legally prohibited from possessing firearms.

(F) Manufacturing, or causing the manufacture of, assault weapons, machineguns, undetectable firearms, unserialized firearms, unsafe handguns that are not on the Department of Justice roster of handguns certified for sale in California, or other generally prohibited weapons