@<u><a href="https://www.nzhuntingandshooting.co.nz/members/veitnamcam/" target="_blank">veitnamcam</a></u>
It it's your gun and you use it in a crime, yes, destroyed, or maybe a place in a police museum.
David Bain was cleared of what by implication may have been his father's crime, hence Joe Karam had it back. It was for Joe Karam, not for David Bain, as part of their book rights etc agreement. No doubt to be used for Karam's book.
If a gun is stolen from me and used in a crime, it is still mine. I have a right to have it back once forensics are completed with it and trial over. Its bloody history would be no worse than many service rifles. Think GC Arisaka or that WW1 SMLE. The fact that I had it get stolen out of my possession in to a criminal's hands would bother me more.
I asked local AO re standard police procedures for examining recovered firearms, but no details given beyond that they have procedures.
I assume it would at least include UV light examination.
There are well developed methods for revealing ground off serial numbers, as the imprint of the serial number causes changes in the metal deeper than the letters themselves, and so to grind them off say the barrel you may need to grind deeper than safely allowed for firing the gun - unless you just want an intimidator.
Interesting page on serial number restoration:
Serial Number Restoration - ppt video online download
http://slideplayer.com/slide/6020194/
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