Even easier..
Why is my Ma driver’s license recognized and accepted outside of mass. And why does Ma accept out of state licences as valid?
But further.. When did a license to carry a firearm (generally) come into law?
After the Civil War with the expressed rationale to prevent Blacks from being armed?
Any state whose firearms permits are not accepted in Massachusetts needs to refuse to accept any documentation from Massachusetts - driver’s license, marriage license, business license, even passenger manifests on aircraft.
Because the libs want disarm everybody.
They are very willing to push communist’s ideas onto others.
But very willing to destroy conservative ideas.