Just saying, that sounds an awful lot like “stop and frisk” (which is not legal in a lot of states) to me. Law enforcement should never bother you while you are in the middle of a legal act and “ask for your papers” aside from game wardens asking to see a hunting/fishing license because they somehow have the right to do so.
Just like how they can’t just pull you over because they feel like it. They are not supposed to inconvenience your day or bother you unless they observe you doing something illegal or have reasonable suspicion that you have. Even if you are stopped for speeding, the rifle with suppressor in the back seat is none of their business and they are not entitled to see any proof that it is legal. If they ask to see papers, you can tell them to pound sand. If they push the issue and conduct an illegal search of your property, you can retire early.
If you are doing something that is legal, the assumption from LE should be that you are allowed to do so. They should not bother you unless they observe you breaking the law or have reasonable suspicion that you are breaking the law. Seeing a suppressor, or an SBR, if possession and use is legal in that state, should not prompt LE to ask for proof that you are doing it legally. The assumption should always be that you are in legal possession. They are on a power trip and operating outside of their job description if they are doing that.
Source: one of my best friends is our local ATF agent and has coached me to handle such situations exactly as I described.