You do not have to install it. You do not have to own an AR-15. Simply possessing the object, if it is deemed "readily convertible" or designed to fit a firearm, is a federal felony. Conviction carries up to 10 years in prison and a $250,000 fine. The "Intended Use" Trap Proponents of the keychain often argue that adding a keyring hole changes the item's "intended purpose." However, federal courts have consistently rejected this defense. If the object’s geometry matches that of a functional auto sear—critical dimensions like sear surface angle, pin hole spacing, and thickness—the addition of a keyring hole does not provide a legal shield.
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. Drop In Auto Sear Keychain
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." You do not have to install it
The "keychain" version is a miniature, often non-functional-looking replica of that sear. It usually includes a hole for a keyring. Some are 3D-printed plastic; others are milled aluminum or steel. Under the National Firearms Act (NFA) of 1934 and the Gun Control Act of 1968, the legal definition of a machinegun includes not only the complete weapon but also " any part designed and intended solely and exclusively, or combination of parts designed and intended, for use in converting a weapon into a machinegun. " Conviction carries up to 10 years in prison
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 .