Owning one requires a federal tax stamp, registration, and a background check—the same process required to buy a legal, registered machine gun. Possessing an unregistered DIAS, even if it is dangling from your car keys next to a plastic panda, is a federal felony punishable by up to 10 years in prison and a $250,000 fine.
According to federal law and ATF rulings, the answer is a resounding yes. Drop In Auto Sear Keychain