An Auto Sear is a few ounces of metal that converts a specific semi-automatic weapon into a machine gun. AR15 sears are drop-in with little or no receiver modification while HK sears have to be fitted and timed in a trigger pack. Just like transferable machine guns, in order for an individual to legally possess an auto sear and the semi-automatic weapon, the sear must have been manufactured before May 19, 1986 and registered in the NFRTR. In these cases the sear is considered the machine gun and will have a serial number for registration.
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