Question about wearing out a legal full-auto
It is my understanding that it is legal for a person with a legally registered fully-automatic firearm to repair the firearm to keep it in working condition.
My question is, what if the receiver wears so badly that it can not be repaired. Can the receiver be replaced and the registry entry adjusted to reflect the new serial number?
If that is legal, could a non-registered receiver be used for the replacement/repair?
Logically speaking, this would be a zero-sum exercise from the standpoint of the registry, but I know it's not always about logic.