As we all know here, anytime a firearm is aquired in any form here in this state, an FA10 is mandated to be filled out. This is pretty clear cut when buying a firearm off someone that already has it registered. Now, other people have asked here if they find a dead relative's firearm what the process is, and as mentioned in other threads here, filling out an FA10 and checking "registration" is the proper procedure. But suppose they didn't do this, and just locked the firearm up in their safe. What are the penalties for this? Same situation if a rifle was bought from the CMP, or from a store out of state. When we bring the firearm into the state, we are supposed to register it, but suppose we don't. Disclaimer: I am not in any way condoning this practice, or saying I would break the Mass law by doing any such a thing, just wondering what the punishment is, and how they can really track this. Also, who is to say you didn't fill out an FA10 and it got lost on their end? We all send in our FA10s when we get a new firearm, but I wonder how many get lost in the process.