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Fed Law says ONLY from a dealer.
I'll let the RI folks answer wrt RI laws, of which I know nothing.
Don't do it. the RI dealer will rat on you to your police department. (law requires it) Not worth it. Get it inbounded to an MA dealer or sent into NH or someplace safe.
Somebody from MA loudly complained to me that RI dealer did not check her ID when she was buying ammo in RI.
I have a ma LTC and a NH no resident LTC can I buy a hand gun in NH and bring back to ma
Bought mine in nh on vaca he called it in did the paperwork and threw it in the trunk with a cable lock all within 25 minutes