MA gun shop? Yeah, no.
Go up to the gun section of Kittery Trading Post, OTOH...
And memo to DUmmies--there's a very good reason why so many states are "shall issue" states versus the "may issue" state you describe. I'll leave it to you to figure out why.
NO,NO, Stay out of the Trading Post unless you have found a few thousand dollars on the side walk.
You will exit with a couple of Kayaks, Moose hide jackets and shoes that will last 50 years. All kinds of cross bows and other archery equipment, throwing knives perfectly balanced made by the Indians up North. Can't forget the wrist rockets and different size ball bearings to play with.
If you fish do not go down stairs, seems like an acre of hand tied fly's, bags of every kind feathers to make your own. All kind of plastic worms, salt water fishing rods and reels, plan to spend 12 hours just looking around.
Want to buy a gun ? You have to leave and go to the State line about 5 miles away and pick it up in NH.