I'm not sure, anecdotally probably impossible to answer. I've only been here a short time, and the law has been around since 1998 I believe?
But, if I try to look at it objectively.... me personally safer? Well I've lived in three states MA, CO, and MT in the last decade.
MT has a pop of 1MM, up from 800M
CO has a pop of 5.8MM up from 4.2MM
MA has a pop of 6.8M up from 6.3M
So MA has had the least growth over time.
MA has always had the strict gun laws, it's also as much high median income, best healthcare system, best metal healthcare, and top education systems (top =top 5, let's not argue about rank) Point being any of those things could also lead to it being safer regardless of gun laws.
Firearm deaths, MA has about the same number as MT despite being much much larger and having a major us metro area.
Compared to Colorado MA has a fraction of the total deaths. CO is in a lot of ways a comparable state in terms of hospitals/education/ etc..
In the last 10 years the firearm mortality rate in CO and MT have increased a lot while MA has stayed pretty flat.
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Are gun laws working, maybe. My argument is that if so it's because in MA there is a high barrier for entry and that fact keep people from owning them.
That being said the closest gun store to my house is in NH and it's kinda a free for all in NH comparatively.
So long answer, MA is certainly safer than CO, hard to say what MA's gun death rate would like had those laws not been passed, maybe they would be trending up like CO and MT.