Mass. Gen. Laws ch. 131, § 67: Rifles, revolvers and pistols; caliber

Section 67. A person shall not use or possess, where birds or mammals may be found, any rifle chambered to take larger than twenty-two long rifle ammunition, or any revolver or pistol chambered to take larger than thirty-eight caliber ammunition between the hours of one half hour after sunset to one half hour before sunrise of any day throughout the year.