Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 140, § 128

Whoever, licensed under section 122 or 122B, sells or furnishes a firearm or ammunition to any person without a firearm license card or permit shall have their license 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, by imprisonment in a state prison for not more than 10 years or house of correction for not more than 2 1/2 years or by both such fine and imprisonment; provided, however, that a valid permit to purchase issued under section 131A may permit certain firearm transfers to persons over 18 years of age. Any person who, without being licensed under section 122 or exempt as provided under section 129C, sells, rents, leases or otherwise transfers a firearm, or is engaged in business as a gunsmith, shall be punished by a fine of not less than $1,000 nor more than $10,000, or by imprisonment for not less than 1 year nor more than 10 years, or by both such fine and imprisonment. Evidence that a person sold or attempted to sell a machine gun shall constitute prima facie evidence that such person is engaged in the business of selling machine guns.

Evidence that a person sold or attempted to sell a machine gun without being licensed under section one hundred and twenty-three shall, in a prosecution under this section, constitute prima facie evidence that such person is engaged in the business of selling machine guns.