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Here is a comprehensive overview of the history, mechanics, legal status, and modern regulatory landscape regarding Drop In Auto Sears and items marketed as keychains.

A Drop-In Auto Sear is an aftermarket component designed to bypass the standard semi-automatic trigger group. It sits inside the firearm's receiver and interacts directly with the bolt carrier and the hammer. Drop In Auto Sear Keychain

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: Here is a comprehensive overview of the history,