If a person bought one of the pre-81 DIAS and put it into a AR-15 that would make the AR a machine gun. If a person filed a form 1, registering the AR-15 as a machine gun, they could put that auto sear into it legally. The auto sear is a conversion part and is now a permanent part of the gun.
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I thought DIAS were the registered part
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That would be referred to as a RDIAS.
There are a lot of married DIAS Registered Receiver guns out there. Lots of AR-15s were converted this way. Many Uzi receivers were registered and converted with slotted bolts. In retrospect, it was not the best way to do things but back then it was the easy way.