Because youre supposed to transport stuff other than your concealed carry in a locked case w/o ammo.. at least thats what I thought when I got that MA permit like 20 years ago. Has something changed?Not sure why you would ever use a trigger lock under transport, trigger locks are legally meaningless in MA at least, for the purposes of transportation. (and completely irrelevant everywhere else) Unless you locked a case and forgot the key to the padlock.....
I had another pistol in the case and a couple rifles and a shotgun in others.