In Massachusetts, you can go to jail for a conviction, for illegally possessing a weapon. For the most part you see this with firearms. Now there are legal ways of having a firearm, you can have a license, that type of thing. But if you don't have a license, you could easily go to jail, particularly depending on what that firearm is, you have an AK-47, people are going to be nervous. So it's a crime that you do need to take seriously. You do want to have a good attorney with you, to try and minimize the chances of going to jail, particularly since those cases are pretty tough to fight, because you've got the officers saying: "found the gun, in his pocket." You can say the officer is lying, but maybe the attorney has better options.What's the Penalty if I'm Caught Carrying a Concealed Weapon in Massachusetts?
Being licensed to possess a firearm at home is different than having a license to carry that firearm, to conceal that firearm. So you can lawfully have a gun in your house, but if you carry that with you, you can still be arrested, you can still be prosecuted for carrying that concealed weapon. What the sentence will be will depend on the circumstances and your defense.