Here's a little gem mass.gov would like you to know about:
"The laws for transporting a firearm can be confusing. Basically, if you keep the firearm unloaded, and locked in a case in the trunk or rear storage compartment of a truck or SUV you will comply with the current law."
Gun ownership in Massachusetts
(that page seems to be the substitute for the former firearms FAQ that was up prior to the website overhaul)
"The laws for transporting a firearm can be confusing. Basically, if you keep the firearm unloaded, and locked in a case in the trunk or rear storage compartment of a truck or SUV you will comply with the current law."
Gun ownership in Massachusetts
(that page seems to be the substitute for the former firearms FAQ that was up prior to the website overhaul)