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Sorry if this is a stupid question, but I just moved to MA from MI (where the firearms laws were very different)...Can I buy a complete AR upper from someone and have them ship it to me in Massachusetts? The way I understand it this is not a firearm without the lower, correct?
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Yes...or you can buy a complete upper and have it shipped directly to yourself. Attaching that upper to a lower becomes a gray area.
Based on the AG's current (and likely wrong...though it'll probably cost $100k+ and several years to fight) interpretation, mounting an upper lower made after 1994 is a 10-years-in-prison felony.
If the upper has a threaded barrel, flash hider, or bayonet lug AND the lower has a pistol grip and removable magazine AND the lower was made after 1994, it's pretty much black-and-white illegal to assemble them.
Also, keep in mind that a "firearm" in MA law isn't what you think of as a firearm. Pistols and revolvers (not shoulder-fired) are considered "firearms" in MA. Rifles and shotguns (shoulder fired) are NOT considered "firearms", they are either "rifles" or "shotguns". Also, unless it's assembled and capable of firing, MA doesn't consider it to be a "firearm", "rifle", or "shotgun" (including lowers...though lowers are subject to federal rules).