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Section 125C. License to sell firearms; transfers restricted to firearm wholesalers; punishment
(a) No licensee may sell, rent, lease or otherwise transfer any firearm described in this section except to a business entity that is primarily a firearm wholesaler, and such transfer must, by its terms, prohibit the purchaser from reselling such firearm to a firearm retailer or consumer in the commonwealth.
(b) The firearm has a frame, barrel, cylinder, slide or breechblock that is composed of (A) any metal having a melting point of less than 900 degrees Fahrenheit; (B) any metal having an ultimate tensile strength of less than 55,000 pounds per square inch; or (C) any powdered metal having a density of less than 7.5 grams per cubic centimeter. This clause shall not apply to any make and model of a firearm for which a sample of 3 firearms in new condition all pass the following test: each of the 3 samples shall fire 600 rounds, stopping every 100 rounds to tighten any loose screws and to clean the gun if required by the cleaning schedule in the user manual, and as needed to refill the empty magazine or cylinder to capacity before continuing. For any firearm that is loaded in a manner other than via a detachable magazine, the tester shall also pause every 50 rounds for ten minutes. The ammunition used shall be the type recommended by the firearm manufacturer in its user manual or, if none is recommended, any standard of ammunition of the correct caliber in new condition. A firearm shall pass this test if it fires the first 20 rounds without a malfunction, fires the full 600 rounds with not more than 6 malfunctions and completes the test without any crack or breakage of an operating part of the firearm that does not increase the danger of injury to the user. For purposes of this clause “malfunction” shall mean any failure to feed, chamber, fire, extract or eject a round or any failure to accept or eject a magazine or any other failure which prevents the firearm, without manual intervention beyond that needed for routine firing and periodic reloading, from firing the chambered round or moving a new round into position so that the firearm is capable of firing the new round properly. This shall not include a misfire caused by a faulty cartridge the primer of which fails to detonate when properly struck by the firearm’s firing mechanism.