tl;dr
NOTHING will ever satisfy the storage requirements of MA state law. Just look at that poor bastard in Lowell (or was it Lawrence?) that had a well-built vault in his basement, but somebody took the time necessary (likely HOURS, according to the police) to cut it open and steal his shit, and the charged the owner (you know, the victim of the THEFT) with improper storage.
The only way to own guns in MA and maintain your sanity is to stop giving a **** about the fact that you stand a very high chance of going to prison for something stupid.
NOTHING will ever satisfy the storage requirements of MA state law. Just look at that poor bastard in Lowell (or was it Lawrence?) that had a well-built vault in his basement, but somebody took the time necessary (likely HOURS, according to the police) to cut it open and steal his shit, and the charged the owner (you know, the victim of the THEFT) with improper storage.
The only way to own guns in MA and maintain your sanity is to stop giving a **** about the fact that you stand a very high chance of going to prison for something stupid.