Believing this subject impacts many full-timer's I thought pointing the thread back toward the OP's topic may provide good information. With that in mind I cut and pasted the below from the frequently asked questions area of the ATF website. Answers about as many questions as it generates.
May a person who resides in one State and owns property in another State purchase a firearm in either State?
If a person maintains a home in 2 States and resides in both States for certain periods of the year, he or she may, during the period of time the person actually resides in a particular State, purchase a firearm in that State. However, simply owning property in another State does not alone qualify the person to purchase a firearm in that State.
[27 CFR 478.11]
May an unlicensed person acquire a firearm under the GCA in any State?
Generally, a person may only acquire a firearm within the person’s own State. Exceptions include the acquisition pursuant to a lawful bequest, or an over–the–counter acquisition of a rifle or shotgun from a licensee where the transaction is allowed by the purchaser’s State of residence and the licensee’s State of business. A person may borrow or rent a firearm in any State for temporary use for lawful sporting purposes.
[18 U.S.C 922(a)(3); 27 CFR 478.29]
Last Reviewed August 31, 2015
What constitutes residency in a State?
For Gun Control Act (GCA) purposes, a person is a resident of a State in which he or she is present with the intention of making a home in that State. The State of residence for a corporation or other business entity is the State where it maintains a place of business. A member of the Armed Forces on active duty is a resident of the State in which his or her or her permanent duty station is located. If a member of the Armed Forces maintains a home in one State and the member’s permanent duty station is in a nearby State to which he or she commutes each day, then the member has two States of residence and may purchase a firearm in either the State where the duty station is located or the State where the home is maintained.
[18 U.S.C. 921(b), 922(a)(3), and 922(b)(3); 27 CFR 478.11]