I like the idea of putting an "ultrahard ceramic" on the end of the firing pin that "would be extremely difficult to file off". That's its coming from a professor of materials science is a little disturbing, though, at least if he's trying to tell the truth. We don't have the ability to manufacture many low-imperfection ceramics, and each of those imperfections is a crack waiting to happen. Most of the ceramic knives out there won't file without a diamond hone, but a good rap with a hammer will shatter em easy.

Makes you wonder if they realize how easy it is to make your own firing pin. They'll just ban that, if they haven't already, but it'll be quite entertaining.

2,500 rounds through a gun really isn't a great sample, too.

Silly ... can be defeated by a nail file ... or a group of firearms owners deliberately swapping firing pins just to screw with the database.

collecting brass from a range (or police range) and dropping it at a crime pretty much makes this system useless (especially if a revolver is used).

what happens then? Innocent (or framed) people are charged with the crime?

plus we all know all the criminals will rush out to buy a laser marked firing pin...