Depends on how technically you read that statute; literally read the statute is a NOOP.
Kinda.
OP isn't trying to sell gunz in Mass.
OP is trying to sell gun accessories at a gun show in Mass,
using a shotgun and a
Shockwave as props.
I understand how police are uniformly instructed to interpret
MGL
Ch. 140 §131G "Carrying of firearms by non-residents; conditions"
as
void because none of
the other 57 states satisfy
this first-world <bleep>hole's
requirements for issuing licenses to felons and addicts.
And rumor is, the first-world <bleep>hole of Massachusetts
regards the Shockwave as a handgun, so 140:131G (at least)
doesn't enable their transitory possession in-state by non-residents.
But isn't non-resident possession of rifles and
shotguns mediated by
MGL
Ch. 131 §129C: "Application of Sec. 129B; ownership or possession of firearms or ammunition;
transfers; report to commissioner; exemptions; exhibiting license to carry, etc. on demand" and
MGL
Ch. 140 §131F "Nonresidents or aliens; temporary license to carry firearms or ammunition"?
Because those latter two statutes don't have the "
never mind" felon/drug clauses.
OTOH, the point seems moot to me.
OP's not proposing to bring his sales tool display gunz
into the state under a 140:131F temporary FID.
And because the
(West) Springfield shows that OP wants to sell at aren't
"[131:129C] (i) ... organized by a regularly existing gun collectors' club or association",
they don't qualify for that exception.
Maybe OP has a "[131:129C] (f) ... valid nonresident hunting license",
and wants to sell "during hunting season"?
Or maybe OP is hoping that some idiot will have a Show Pop,
so the negligent discharge qualifies the show venue as a
"[131:129C] (g) ... firing or shooting range"?