Do not ever take for granted that law enforcement, I don’t care of what country, even remotely understand the nuances of firearms regulations, here in the US as well. I’ve had to defend roughly a half dozen different folks over the last decade who were charged with firearm related charges that simply did not exist and each of those were because the officer did not understand the law. What is scary to me however is that the charges made is passed the district attorney with the state still pursuing them. These were all state cases, ones I do believe the Feds would have known better. Also all ones that were later dismissed, but only after facing serious felony weapons charges, and in the instances coming to mind were the main or highest level offense charged.
One case I couldn’t initially fault the trooper since the serial number was somewhat hidden. It was a case where the gent was stopped for other things but when the trooper looked at his rifle he did not see any visible serial number so the gent was arrested for possessing a firearm with altered or removed serial number and was subjected to interrogation about where he stole the weapon. It was an old military Mauser (cannot remember which make now as I type this) that he had sporterized back in the 90’s. Had a Fajen like laminated stock and was teflon coated. When I got initial discovery, it included photos of the weapon and what shocked me was that the trooper also took photos of it after he took a pair of Fisker scissors to the barrel shroud, scraping the teflon coating off in an attempt to read the fine engraving underneath. In the photo there was a bunch of fine stainless shavings in with all the teflon and the trooper was unable to read the engraving, and actually pointed to that aspect as some kind of evidence that the number had been sanded down to prevent identification…when he was the one that actually adulterated it in the first place. Moreover, he totally failed to understand what he was even looking for since it was not part of the receiver in the first place. He had scraped off the chambering engraving. I was just dumbfounded but helped me realize just how little some of these folks know about weapons and federal firearm laws.
Once I was finally able to compel an inspection with basic disassembly, which required court assistance before they would allow, like I was going to destroy the rifle they already boogered up, the mystery was solved. Just like I had shown the prosecutor and judge, the serial number on that particular make rides very low on the receiver, but may likely match the numbers visible on other parts. As soon as I was loosened from the stock, viola, there was the serial number which also showed the trigger and bottom metal were original to the weapon as well. All that mess because the individual charging and those prosecuting did not understand the laws they are charged with enforcing.
Just this year I had two young mean charged with federal firearms violations under our state law, one for having a short barreled rifle and the other for having a handgun with removed serial number. Neither a valid charge. The short barreled rifle is actually a pistol, and ATF recognizes as such, and the handgun with removed serial number, as some might guess, was an 80% kit frame finished here in this state and legal at the time and now. Again, both rectified, but only after formal charging and having to fight it in court.