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The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) considers any device designed solely to convert a semi-automatic firearm into a machine gun to be a machine gun itself, regardless of whether it is installed, made of plastic, or attached to a key ring.

While the term "Drop In Auto Sear Keychain" might sound like a harmless novelty to some, it represents a significant legal trap. Due to the precise functionality they can offer, law enforcement agencies classify them as illegal machine guns. Drop In Auto Sear Keychain

The law could not be clearer when it comes to functional auto sears. Under federal law, an unregistered DIAS, whether carried in a safe, a pocket, or on a keychain, is an unregistered machine gun. Possession is a federal crime, and being found with one can lead to severe penalties, including decades in federal prison. News reports are filled with examples of individuals facing decades-long sentences for selling or possessing similar auto sear devices. The Bureau of Alcohol, Tobacco, Firearms and Explosives

: It effectively converts a standard civilian semi-automatic rifle into a fully automatic machine gun. The "Keychain" Loophole and Deceptive Marketing The law could not be clearer when it

A standard DIAS is a small part designed to be placed inside a semi-automatic AR-15 lower receiver. Its purpose is to override the trigger mechanism, allowing the firearm to fire continuously with a single pull of the trigger—effectively converting it into a machine gun.

In ATF Ruling 81-4, the agency made clear that a device is a "machine gun" if it was originally designed as a fire control component. Adding a secondary function (like a key ring holder) does not negate that primary design. In plain English: