Citation(s) from the GunPolicy.org literature library
State of Massachusetts. 2012 ‘Mass. Gen. Laws ch. 140, § 123, etc..’ Firearms Law Database - Gun Shows in Massachusetts. San Francisco, CA: Giffords Law Center to Prevent Gun Violence. 2 January
Gun Shows in Massachusetts
A licensed firearms dealer in Massachusetts is permitted to sell or transfer firearms and ammunition at a gun show open to the general public, as long as the dealer complies with the licensed dealer conditions in Massachusetts law and ensures that such sales or transfers are in conformity with federal and state law, including the prohibitions on sales to purchasers who lack the required firearm identification cards, licenses to carry firearms, and/or permits to purchase, rent or lease firearms.
Unlicensed sellers may transfer "not more than four" firearms in any one calendar year, so long as both the buyer and the seller have the proper cards, permits or licenses to possess or purchase the types of firearms being transferred, and the seller reports the sale to the state, as required by law…