Please let us all know what questions you are asked
Your situation is distinct example of what is wrong with the process in Massachusetts, arbitrary, capricious and vague. Better that we might subscribe to the regular background process, complete the forms, pay your money and take possession, contemporaneously. As for concealed carry? Maybe a training program or something similar to what Andrew Branca presents to assist the firearm owner in understanding compliance, safety and obligations that come with the proposition.
Good luck with your interview and with finding ammunition for whatever firearm you may prefer.