I can't even imagine a brand new pistol having marks that would distinguish it from others. Maybe certain batches or lots would have distinguishable marks, but gun to gun on a newly manufactured firearm seems really far-fetched.
I agree with JonM (nothing new here
) that it is just a huge waste of money...however it is NOT government money being wasted. It is another of those cases of onerous regulation that we hear about that costs consumers more and more money they shouldn't have to spend.
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face