A Drop In Auto Sear (DIAS) Keychain is a controversial and highly illegal device under United States federal law. While sometimes marketed as a novelty item or "keychain," the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) classifies these devices as machine guns because they are parts designed and intended to convert a semi-automatic firearm into a fully automatic one. Technical Overview
: These allow a shooter to tune the gas system for different types of ammunition or suppressed fire, which can reduce felt recoil. Drop In Auto Sear Keychain
Conclusion
The Drop In Auto Sear Keychain exists in a legal twilight zone. It is simultaneously a piece of irreverent gun culture satire and a potential federal felony waiting to happen. A Drop In Auto Sear (DIAS) Keychain is
Deceptive Marketing: Sold as "novelty bottle openers" or "wall art." Conclusion Conclusion: A Novelty Not Worth the Risk
Functionality: Understand how the device works. A "drop-in" auto sear is designed to be easily installed or integrated into a firearm, but its operation should be straightforward and not negatively impact the firearm's reliability.
Under the National Firearms Act (NFA) and the Firearms Owners' Protection Act (FOPA), the legal status of an auto sear is clear: