What about YOUR STATE law??? FA-10 form?? 10 Days to Legally Register your Out-of-State Purchase? You buy it as a "Maine Resident" or a "NH Resident" with your Property tax bill, and THEN intentionally bring it into another State and STORE it there?? Ohh C'mon now.....You have 10 DAYS to Register it... RIGHT? ........... Do it at your OWN Peril then... I'm not gonna slit hairs on this one....Lol where does it say that in US code?
From your Massachusetts State Police Firearms Registration... https://mircs.chs.state.ma.us/fa10/action/home?app_context=home&app_action=presentTrans