That's probably what the law is.
In MA, a douche cop would arrest you for it, turn it over to the DA, and force you to spend money defending yourself for probably a dismissal or a not guilty.
If someone is going to be that afraid of the system they shouldn't even bother owning guns. Just drive around with a pacifier in their mouth and a mask over the
top of it. Everywhere.
like think about the inherent stupidity of it. What is he going to do, throw his bolt on the dashboard? In order for it to even be found he has to get searched. Unless his car has
ghetto lyfe signs all over it, that's not very likely. Buy a powerball ticket, your odds are better.
A BCG is not a firearm, or anything resembling a controlled item under MGL. A BB Gun is more regulated than an AR BCG is in mass.
If someone is really panicky they can remove the bolt part from the carrier and just bring the carrier. The carrier by itself is not even capable of touching off ammo. You literally do not need anything except for the carrier and the new key, and whatever hardware accompanies it, to get this work done.