was actually a “drop-in auto sear,” a small piece of plastic that could turn the popular AR-15 rifle into an illegal machine gun. The product, still available at the excitingly-named ...

An ATF agent inspected the contents of the box and recognized them as drop-in auto sears, which when installed into an AR-15 allows the weapon to fire more than one round with a single trigger pull.

Reed says auto sears are being used to transform weapons ... A video supplied by the ATF shows a converted Glock 9mm pistol and an AR-15 firing automatically. It's important to note firearms ...