Sear Keychain | Drop In Auto

In the world of firearm accessories and 3D-printed novelties, few items have generated as much legal controversy and law enforcement attention as the so-called "Drop In Auto Sear Keychain."

The ATF has repeatedly issued classification letters stating that a drop in auto sear—even one sold as a "keychain," "paperweight," or "display model"—is itself a machinegun if it is shaped and dimensioned to function as a sear. Drop In Auto Sear Keychain

This article is for informational purposes only and does not constitute legal advice. Firearms laws vary by jurisdiction and are subject to change. Consult a qualified attorney regarding any NFA item. In the world of firearm accessories and 3D-printed

At first glance, it looks like a simple piece of plastic or metal: a small, often red, oddly shaped fob meant to dangle from your keyring. However, to the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) and federal prosecutors across the United States, this "keychain" is considered a . Consult a qualified attorney regarding any NFA item

Here is what every gun owner, collector, and 3D-printing enthusiast needs to know before this object ends up in their pocket. An "auto sear" is a component within a fully automatic firearm that catches the hammer or striker until the bolt is fully closed, allowing for "slam-fire" cycling. In a semi-automatic AR-15 platform, adding a third-pin auto sear (like a "Drop In Auto Sear" or DIAS) bypasses the trigger group's semi-auto limitation, enabling continuous firing with a single pull of the trigger.