Having said that, no this is false. There was some silly idea to do it by the extreme left wing liberal and anti-gun community but the manufacturers cannot do it and it cannot be enforced economically. It would require retooling. Plus how do they register the numbers? I mean, how can they know who bought what? That's impossible with internet sales, face to face sales etc. Plus, all it would take is someone to file or grind that number to be unreadable and it's worthless to stamp anything on the casing.