Section 16.05 - Sale of Handguns Without Childproofing(1) It shall be an unfair or deceptive practice to sell a handgun without a safety device in violation of M.G.L. c. 140, § 131K.(2) It shall be an unfair or deceptive practice for a handgun-purveyor to transfer or offer to transfer to any customer located within the Commonwealth any handgun which does not contain a mechanism which effectively precludes an average five year old child from operating the handgun when it is ready to fire; such mechanisms shall include, but are not limited to: raising trigger resistance to at least a ten pound pull, altering the firing mechanism so that an average five year old child's hands are too small to operate the handgun, or requiring a series of multiple motions in order to fire the handgun.(3) It shall be an unfair or deceptive practice for a handgun-purveyor to transfer or offer to transfer to any customer located within the Commonwealth any handgun which does not contain a load indicator or magazine safety disconnect.(4)940 CMR 16.05(2) shall not apply to handguns which have a hammer deactivation device. 940 CMR 16.05(3) applies only to handguns that have a mechanism to load cartridges via a magazine.