While this is true according to fed law, I doubt it has ever been used to actually convict anyone, or even charge anyone, for that matter. (If there's case law on this, It'd be interesting to see it... but IMHO this law is even a couple of steps dumber than GFSZ is. ) ...
((ATF FAQ)):
To whom may an unlicensed person transfer firearms under the GCA?
While the ostensible purpose is to explain the law to proles,
I bet an ATF agent who has a hard on to arrest someone
will use it as a sanity check before they saddle up.
I can believe that a non-FPP (LTCed?) Mass. resident wandering NH
with a handgun borrowed from someone in NH
won't set the machine in motion if it's noticed during a traffic stop.
However, if a Mass resident on vacation
actually uses a borrowed NH handgun in self-defense in NH,
that's going to have consequences.
If they have to defend against assault/murder charges,
the prosecution will at least troll the jury that the possession was a Federal crime
during the trial, even if they don't try to convince ATF to start a Federal case.
(Ayoob acts like the prosecutor will go FR about a gun being extra-killy
if the lab so much as detects a drop of Rem Oil on the sear,
let alone has "Smile and wait for flash" engraved in the muzzle crown.
How could a prosecutor resist piling on about an illegal loan?)
And the NH guy that loaned the gun is going to get in trouble in ways
he probably wouldn't if he had loaned it to a NH resident.
So loaning a NH Glock to a buddy vacationing from Mass
may be a
really stupid thing to do.