I'm not saying using a registered "receiver gun", but using a complete registered "sear gun". Putting a registered "sear" in a gun does not convert to a registered "receiver gun" and the law does allow for that registered "sear" to be moved from gun to gun, including "new" firearms. Providing that the NFA register part was the "sear", the internals can be cannibalized to a new gun and the fantasy AR10 can be made full auto.
There are registered sears, bolts and receivers. Only the registered "receiver" gun cannot be cannibalized of its parts and made into a new gun.
DIAS is the registered part in a "sear" gun.
Now that we have a glossary of terms, are we on the same page now?