Mass. Gen. Laws ch. 140 § 131B
Whoever loans money secured by mortgage, deposit or pledge of a firearm, rifle, shotgun or machine gun shall be punished by a fine of not more than five hundred dollars or by imprisonment for not more than one year, or by both; provided, however that nothing herein shall prohibit a bank or other institutional lender from loaning money secured by a mortgage, deposit, or pledge of a firearm, rifle, shotgun or machine gun to a manufacturer, wholesaler, or dealer of firearms, rifles, or shotguns. The provisions of section one hundred and twenty-three shall not be applicable to any such mortgage, deposit or pledge unless or until the lender takes possession of the collateral upon default or the collateral is removed from the premises of the debtor.
Mass. Gen. Laws ch. 140, § 131B