This should clear up some things.
State law covers this, the following is the discription that is used to cover all firearms. Rifle, pistol, black-powder, cannon ect.
This info is straight out of the Rhode Island General Laws.
(3) "Firearm" includes any machine gun, pistol, rifle, air rifle, air pistol, "blank gun," "BB gun," or other instrument from which steel or metal projectiles are propelled, or which may readily be converted to expel a projectile, except recurve, compound, or longbows, and except instruments propelling projectiles which are designed or normally used for a primary purpose other than as a weapon. The frame or receiver of the weapon shall be construed as a firearm under the provisions of this section.
And a town has the right to impose ordinances to protect the people of said town from harm, noise and a host of other things.
Towns and cities
§ 45-6-1 Scope of ordinances permissible. – (a) Town and city councils may, from time to time, make and ordain all ordinances and regulations for their respective towns and cities, not repugnant to law, which they deem necessary for the safety of their inhabitants from fire, firearms, and fireworks; to prevent persons standing on any footwalk, sidewalk, doorstep, or in any doorway, or riding, driving, fastening, or leaving any horse or other animal or any carriage, team, or other vehicle on any footwalk, sidewalk, doorstep, or doorway within the town or city, to the obstruction, hindrance, delay, disturbance, or annoyance of passersby or of persons residing or doing business in this vicinity; to regulate the putting up and maintenance of telegraph and other wires and their appurtenances; to prevent the indecent exposure of any one bathing in any of the waters within their respective towns and cities; against breakers of the Sabbath; against habitual drunkenness; respecting the purchase and sale of merchandise or commodities within their respective towns and cities; to protect burial grounds and the graves in these burial grounds from trespassers; and, generally, all other ordinances, regulations and bylaws for the well ordering, managing, and directing of the prudential affairs and police of their respective towns and cities, not repugnant to the constitution and laws of this state, or of the United States.
(b) Town and city councils shall furnish to their senators and representatives, upon request and at no charge, copies and updates of all ordinances and regulations.
Narragansett does have a ordiance in regards to hunting east of Sprague Bridge. I will find it for you and post it here. If I can't find it, I will eat crow here just the same!
You are correct that we as citizens of the State of Rhode Island, have the right to access coastal waters from the waters edge to the high water mark, but this is not a federal law, it's a article in the Rhode Island Constitution. It is unique to this state. Please read Article 1 section 17 of the Rhode Island Constitution.
Section 17. Fishery rights -- Shore privileges -- Preservation of natural resources. -- The people shall continue to enjoy and freely exercise all the rights of fishery, and the privileges of the shore, to which they have been heretofore entitled under the charter and usages of this state, including but not limited to fishing from the shore, the gathering of seaweed, leaving the shore to swim in the sea and passage along the shore; and they shall be secure in their rights to the use and enjoyment of the natural resources of the state with due regard for the preservation of their values; and it shall be the duty of the general assembly to provide for the conservation of the air, land, water, plant, animal, mineral and other natural resources of the state, and to adopt all means necessary and proper by law to protect the natural environment of the people of the state by providing adequate resource planning for the control and regulation of the use of the natural resources of the state and for the preservation, regeneration and restoration of the natural environment of the state
You can not cross private property to access that area. So that being said, there are lots of places that can only be reached from a boat or getting very wet.
Give me a few days, I'll research this crap and get back to you.
It's not my fault I'm at the top of the foodchain.