An individual would need intimate knowledge of firearms and microstamping, plus the appropriate tools, in order to render the technology ineffective. These tools are certainly not "household items," nor would the common street criminal be expected to have the knowledge necessary to defeat the technology.

[...]

One can also imagine the scene at a shooting range as criminals or gang members wander around and gather spent cartridge cases in bags. Conspicuous? One would certainly think so, and Americans should expect the owners of such ranges to engage in more responsible business practices.

Coalition to Stop Gun Violence & the Educational Fund to Stop Gun Violence
Microstamping Technology: Precise and Proven
[Another example of the anti-gun bigots being clueless about the real world. Apparently they haven't heard of a Dremel tool or picking up your brass for reloading.--Joe]