No. it means that if they notice you have a firearm, they can tell you to leave. If you refuse, you can be trespassed. Stop making shit up. Learn the law. That is not what the law says and in Massachusetts a sign is not legally binding.This has been covered a thousand times on NES and spreading false info does not help anyone. Policies and laws are different. Many malls have signs banning firearms, that does not make it law.
I don't own any cheap firearms, and my WWII Marine father taught us how to strip and replace gun parts before I was 12, and I got real good at it as an Infantry Marine myself, especially when bored to tears floating on a Navy ship where we would detail strip and reassemble everything for M60's to 1911's just to pass the time, so I don't need to consult books or the internet.
But here is a news flash for you, you don't let anyone in without a warrant. And if they show up with a warrant, you have way bigger problems than your storage habits. They won't give a frogs fat ass where your firing pins are stored. Your guns are leaving.
So, just in case some newbs are reading this and don't prescribe to your paranoia...
It is perfectly legal to store you firearm with just a trigger lock in your home. Long gun in a closet with a trigger guard? Legal. Pistol in a shoe box with a trigger guard? Legal. Hell, it is legal sitting on your coffee table. It is stupid, but not illegal
It is perfectly legal to store a loaded firearm in a safe, or a bedside/nightstand safe. A quick access safe with a loaded firearm is not only legal, it is smart.
It is perfectly legal to store a fire arm in a safe with the ammo and loaded magazines. You can keep your AR in the safe, with 10 loaded 30 round magazines on the shelf right next to it. And while it is not a good idea to store thousands of rounds in your safe, and I keep most ammo separate except for some loaded magazines, it's legal.
It is perfectly legal to store your firearm in a locked case in your vehicle without a trigger lock. It has to be unloaded and ammo has to be separate. The ammo does not have to be locked up. It can be in a paper bag on the backseat. Legal. Everyone that carries should have a lock box for their vehicle
Gun owners who interpret laws incorrectly, and then spread false info to fit their own foolish narrative don't help anybody but the gun grabbers. It is not illegal to carry a gun in a hospital. There are a few "teaching hospitals" like Tufts that have schools on the premises but even most of those keep the schools separate and hard to get into. Just because a hospital, restaurant, shopping mall or other establishment puts up a sign that says "No guns" doesn't make it a crime to carry a gun there in Massachusetts.
Schools, post office, courthouse ( and some will check your firearm) and Federal buildings. That's it. If you are going to own and carry, you really should take the time to learn the laws. Oh, and stay off the Boston common and check the laws for national/state parks.
But, you do you BooBoo. You want to pull your firing pins, go for it.