MA requires a loaded chamber indicator, which Glock's does not comply with.. so Glock said goodbye to MA. Pre 1998 Glocks are legal however..
http://www.fsguns.com/fsg_information.html
Glad I live in a free state that pretty much doesn't care what you own.
Well, Glocks do have a loaded chamber indicator, but since it's not a red stop light that says LOADED they don't think it's good enough.