This is a good link:
General Laws: CHAPTER 140, Section 121
Which supports your assertation. And I'd be inclined to agree with you. BUT.... In actual practice there was a guy in MA (covered in other threads) who got jammed up pretty good for carrying an Antique Handgun without an LTC-A CC. I believe he was acquitted on appeal. Not a good situation.
I buy Antiques from a MA FFL. He makes me do the background check thing every time. Just like I were buying a Brand New Glock. Caution is king.
As far as Antiques go, Mass Law states Firearms manufactured in 1889 are Antiques, CONTRARY to the ATF which states clearly only BEFORE 1899. What does the extra year buy you ? A Federal Felony should you ship an 1899 Firearm across State Lines without FFL on both ends.
And the Laws in NY, IL, CA, and CT ? As bad as MA, probably worse.