Federal Review Finds No Evidence That Microstamping Is Reliable
For nearly two decades, gun-control politicians have promoted firearm “microstamping” as if it were a proven crime-solving tool. Gun owners and manufacturers have pointed out the obvious problems: firing pins wear, fouling obscures microscopic markings, parts are easily replaced, and anyone can pick up another shooter’s brass. Now, a federal technical review has refused to validate the politicians’ sales pitch.
The National Institute of Standards and Technology (NIST), an agency within the Department of Commerce, reviewed the available research at the request of House Science, Space, and Technology Committee Chairman Brian Babin, R-Texas. Its response, reported by the National Shooting Sports Foundation, found that the existing studies do not establish that microstamping consistently produces repeatable and legible identifying marks.
“There is significant disagreement regarding the viability of this technology,” NIST stated.
That is a considerably different conclusion from what gun-control politicians in California and New Jersey have been telling the public.
What Microstamping Is Supposed to Do
Microstamping generally involves laser-engraving an identifying code onto a pistol’s firing pin. When the pistol is fired, the firing pin is supposed to imprint that code onto the primer of the spent cartridge case.
In theory, investigators could recover the casing and use the code to identify the firearm connected to it. That is the sales pitch. But as always, the real world is far less cooperative.
NIST noted that firearm design, ammunition type, primer coatings, residue, firing-pin movement, wear, repeated firing, and maintenance can all affect whether the microscopic code is transferred clearly enough to be read. Rimfire ammunition presents another problem because it does not use a centerfire primer.
The agency also found that the available studies are too limited to demonstrate viability across the broad range of firearms and ammunition found in actual use. There have not been adequate large-scale, independent blind studies establishing that the technology will work reliably outside a controlled demonstration.
NIST did not conduct its own laboratory testing and does not currently maintain a microstamping research program. That limitation should be reported clearly. This was a review of existing research, not a new federal experiment.
Even with that caveat, NIST could not confirm the claims being used to justify state mandates.
The agency also acknowledged the problem every gun owner immediately sees: A criminal can replace the firing pin, damage the engraved surface, or swap parts. NIST reported that no realistic mechanical solution currently exists to prevent those modifications.
Of course, the criminal who steals a gun, files off a serial number, or carries it into a robbery is unlikely to worry about violating another law prohibiting alteration of a microstamp.
California Is Moving Toward a 2028 Mandate
The federal findings are an important development as California is preparing another microstamping requirement under Senate Bill 452.
California Attorney General Rob Bonta’s office declared the technology viable in July 2025. The state must next determine whether qualifying components are commercially available at reasonable prices or whether microstamping-enabled pistols are readily available for purchase.
If California makes that additional finding, licensed dealers could be prohibited beginning January 1, 2028, from transferring newly manufactured or delivered semiautomatic pistols that have not been certified as microstamping-enabled.
AmmoLand has covered California’s use of microstamping requirements to keep modern pistols off its handgun roster. After the state activated its earlier mandate in 2013, ordinary Californians were largely restricted to older handgun designs because manufacturers could not add new semiautomatic pistol models without complying with an impractical requirement.
That was never a technological accident. An impossible product mandate functions as a ban without lawmakers having to admit that they passed one.
New Jersey has followed the same playbook. In 2024, Attorney General Matthew Platkin declared microstamping viable and began implementing a law intended to create a roster of approved pistols. As AmmoLand reported at the time, the state had not identified a commercially available pistol that gun dealers could actually stock.
Gun Owners Pay for Political Theater
Microstamping does not stop a violent criminal from obtaining, stealing, or firing a gun. It does not prevent someone from replacing a firing pin. It cannot establish who fired a recovered firearm, and it creates the possibility that brass collected from a public range could be planted at a crime scene.
What it can do is increase manufacturing costs, shrink the number of handguns available to lawful buyers, create new databases, and give anti-gun officials another excuse to ban ordinary firearms.
The Second Amendment does not allow government to condition the purchase of a common handgun on compliance with speculative technology. The burden remains on the government to justify its restrictions—not on gun owners to redesign firearms around a political fantasy.
NIST’s review does not repeal California or New Jersey law, and it is not a court ruling. But it does strip away part of the claim that microstamping is settled science. Lawmakers considering these mandates now have a federal technical assessment warning that the technology remains disputed, inadequately tested, and easily defeated. Gun owners have been saying that for years.
About Duncan Johnson:
Duncan Johnson is a lifelong firearms enthusiast and unwavering defender of the Second Amendment—where “shall not be infringed” means exactly what it says. A graduate of George Mason University, he enjoys competing in local USPSA and multi-gun competitions whenever he’s not covering the latest in gun rights and firearm policy. Duncan is a regular contributor and editor-in-chief for AmmoLand News and is responsible for AmmoLand’s daily gun-rights reporting and industry coverage.