Recently, while touting gun seizures in a city that has some of the most authoritarian gun laws in the United States, Police Commissioner Jessica Tisch lamented, "the number of illegal guns that we've seen used in New York City has exploded since 3D technology has come about." She's not alone. Homemade guns are increasingly sophisticated and available almost everywhere. That's a good thing.

American dedication to privately owned weapons alarms observers from more restrictive countries—much to the amusement of many Americans, it should be noted, whose ancestors fled those places in search of greater freedom and found it, in part, in the ability to arm themselves and to generally flip the bird to government. That means that from the foundation of the U.S., privately owned weapons and their

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