Sear Keychain — Drop In Auto

: When used with a full-auto capable trigger and bolt carrier group, it allows the weapon to fire continuously as long as the trigger is held.

For more information on the Drop In Auto Sear Keychain, including product specifications, tutorials, and reviews, please visit the following resources:

Often classified as a Machine Gun by the ATF upon inspection. Can be sold via Form 4 transfer. Cannot be legally bought, sold, or possessed by civilians.

Dropping a cheap, poorly machined, or 3D-printed keychain sear into a standard civilian firearm can cause catastrophic mechanical failure. The gun may suffer out-of-battery detonations (where the bullet fires before the chamber is fully closed), exploding the receiver and causing severe injury to the shooter. Furthermore, cheap sears can cause the weapon to run away completely, firing uncontrollable bursts even after the shooter lets go of the trigger. Drop In Auto Sear Keychain

Unlike a simple bottle opener or a miniature shell casing, a drop-in auto sear (DIAS) isn't just a random shape. It is a replica of a specific firearm component, and because of what that component is, the innocent-looking keychain in your pocket could attract the serious—and potentially life-ruining—attention of federal law enforcement.

Within the firearms community, the Drop In Auto Sear Keychain is surprisingly divisive.

Some of these items were sold as flat pieces of steel with the outline of the auto sear laser-engraved or partially cut into the metal. The marketing surrounding these products often leaned into a "novelty" or "political statement" angle, suggesting that because the item was attached to a key ring or required further cutting, drilling, or bending to function, it was merely a harmless piece of metal. : When used with a full-auto capable trigger

This is the provision that makes possessing a real DIAS a serious felony.

The ATF actively monitors the sale and distribution of conversion devices. Purchases made online are often tracked, leading to investigations and seizures.

The DIAS keychain has become a flashpoint for several key controversies: Cannot be legally bought, sold, or possessed by civilians

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Many of the keychains sold alongside the DIAS are modeled after the "Glock switch," the pistol counterpart to the rifle's auto sear. This small device, often no larger than a postage stamp, snaps onto the back of a Glock pistol and forces it to fire continuously as long as the trigger is depressed.