Mass. Gen. Laws ch. 140 § 130
Whoever sells or furnishes a rifle, shotgun or ammunition to any alien 18 years of age or older who does not hold a permit card issued to that alien pursuant to section 131H or, except as provided in this section or section 131E, whoever sells or furnishes any alien or any person under 18 years of age a rifle, shotgun, machine gun or ammunition, or whoever sells or furnishes to any person under 21 years of age a firearm or large capacity rifle or shotgun or ammunition therefor shall have the license to sell firearms, rifles, shotguns, machine guns or ammunition revoked and shall not be entitled to apply for such license for 10 years from the date of such revocation and shall be punished by a fine of not less than $1,000 nor more than $10,000, or by imprisonment in a state prison for not more than 10 years or by imprisonment in a house of correction for not more than 2 1/2 years or by both such fine and imprisonment.
Mass. Gen. Laws ch. 140, § 140:130