The sherrif in my county said that if it is stolen/confiscated it will be destroyed if it doesnt have an I.D/ Sn on it for proof of ownership
Thats interesting, normally that is what they do on a production gun that the number has been illeagally removed from but since a huge number of cheaper antique guns including my very first .22 rifle were built before serial numbers were mandatory. I suspect if they took one of these legally owned older guns away from you they would have second thoughts as soon as my lawyers arived
As for having your name or whatever engraved on the gun it all comes down to what the officer wants to do. Its like getting stoped by DOT, if your driving a brand new truck home from the factory and the guy wants to write you up for something, HE WILL find a violation someplace! If the cop wants to take your gun away he will not let you open the top cover to show your engraving, he will not look at your papers and if he wants to
take it I doubt having SEMI will make a difference anyway. I remember back in the 80s a guy got a Cobray semi Mac taken away because the policeman had seen one shoot full auto on Miami Vice and he finally gave up on getting it back.
Also, unless you got a paper trail on the gun I doubt you knowing the number stamped in it will get it back if stolen. They busted some meth heads here two years ago who had a shed full of stolen stuff, guns, antiques, jewelry, saddles, coins, even some farm equipment. If you didn't have a legal document saying that old shotgun or highback saddle was your grandfathers it all got loaded up and taken to a consignment sale on the other ene of the state! and Yep, some people did drive over to buy back their guns and stuff

I am not blaming the police for this completely, it just seems like the county-state or whoever has some bad policyies. Hotch