reconbob, I can only speak from my experience. I take in a lot of LE class III trade-ins (ex. St. Louis Thompsons). Over the past 15 years I have cut up over 1,000 post sample guns. Mostly HK's and M16 variants. All this was done with a simple chop saw. That being said, during these years I have also had inspections. The inspectors conducting my inspections know exactly what I do and how I do it. I notify NFA of every class III receiver I destroy, to help keep the registry up to date. However, there is nothing saying that I have to notify them of the destruction. That being said, anyone getting a parts kit from me will not get the serial numbered portion of the receiver. Roger