Some manufacturers make guns specifically to comply with Massachusetts laws others just won't bother such as glock.Concerning MA firearm laws. If the firearm does not have a safety mechanism you can't purchase it in your state? If so, you options are pretty limited. Smith and Wesson has the M&P 45 auto 4.5 with a safety and also the M&P 45 shield has a safety features as well.
Now I can buy a Glock in Massachusetts if I'm willing to pay a lot more than MSRP because there are ways around the law but I don't feel they're worth over sticker. At sticker I would definitely own one.