[PapaBear3625]

Pull the firing pin, replace with an aftermarket unmarked one, or place the tip in a piece of fine emory cloth or board, give it a few spins and Voala! The microstamp is gone.

They understand that. The bill text states:

6. (A) Any person who wilfully defaces any machine-gun, large capacity ammunition feeding device or firearm, INCLUDING DEFACING A MICROSTAMPING COMPONENT OR MECHANISM OF A SEMIAUTOMATIC PISTOL AS DESCRIBED IN SUBDI- VISION TWENTY-FIVE OF SECTION 265.00 OF THIS ARTICLE, is guilty of a class D felony.

So if the police find you in possession of a firearm whose serial number indicates that it was manufactured after the date of the bill, and where the microstamping feature is disabled, then they charge you with a felony for each firearm. You can be sure that the police will use any opportunity they can think of to inspect your guns for such a violation.

[Ruy Dias de Bivar]

So what are they going to start doing? Have weekly firing pin inspections?

“Show me your papers and firing pin!”

[SWAMPSNIPER]

"Did you really think we want those laws observed?" said Dr. Ferris. "We want them to be broken. You'd better get it straight that it's not a bunch of boy scouts you're up against... We're after power and we mean it... There's no way to rule innocent men. The only power any government has is the power to crack down on criminals. Well, when there aren't enough criminals one makes them. One declares so many things to be a crime that it becomes impossible for men to live without breaking laws. Who wants a nation of law-abiding citizens? What's there in that for anyone? But just pass the kind of laws that can neither be observed nor enforced or objectively interpreted – and you create a nation of law-breakers – and then you cash in on guilt. Now that's the system, Mr. Reardon, that's the game, and once you understand it, you'll be much easier to deal with."

Ayn Rand

('Atlas Shrugged' 1957