Time to retire this sad entire thread. The question and input was that engraving receivers on a Form 1 SBR was not required? Seems this is true as stated? Completely true. The failure was that some parties did not choose just to say they did not understand. Their reactions were non professional, personal and ugly. Not good. Again ... for some reading this, engraving receivers on a SBR Form 1 is not required.
But ... and here is the other boot dropping, engraving is still necessary. One has the choice of either the receiver, frame or barrel. With the Ruger 10-22, engraving the receiver is the logical choice. However ... it is not the legal choice. A great distinction. Again, one has the choice of either the receiver, frame or barrel. That is the NFA law. This is an Excellent Forum. It is regrettable that input was non professional.
All Oregon, US Code Law And NFA Rules Apply.
Classic pot calling kettle black