Summary of Maine Gun Laws
Maine is a shall-issue, permitless carry state with concealed weapons permits issued at the state level by the Department of Public Safety through the Maine State Police.
There is no permit, background check or firearms registration required to buy a handgun from a private individual.
Open and concealed carry are legal in Maine without a permit. Any person 21 or older, or at least 18 and active duty or honorably discharged military, who can legally possess a firearm, is allowed to carry openly or concealed. In addition, Maine issues permits for reciprocity purposes.
Maine Permits to Carry Concealed Handguns (CCHs) require a firearms training course that has been approved by the state. Maine CCHs are issued to residents and non-residents that are at least 18 years old. Some areas are off-limits, including schools and courthouses. In terms of reciprocity, since Maine has permitless carry, any person at least 21 years old who can legally possess a firearm may carry a concealed firearm on his or her person without a license or permit. In addition, Maine also recognizes resident concealed handgun permits issued by another state if that state recognizes Maine’s resident CCHs. Permit holders from these states are allowed to carry in a few areas that individuals who carry under the permitless carry law cannot, including Acadia National Park.
Self-Defense
Maine is a Castle Doctrine state. There is no stand your ground law, so an individual has a duty to retreat outside of his or her dwelling place.
Physical Force in Defense of a Person
A person is justified in using a reasonable degree of non-deadly force upon another person in order to defend the person or a third person from what the person reasonably believes to be the imminent use of unlawful, non-deadly force by such other person, and the person may use a degree of such force that the person reasonably believes to be necessary for such purpose. However, such force is not justifiable if:
The person provoked the use of unlawful, non-deadly force by the other person; or
The person was the initial aggressor, unless the person withdraws from the encounter and effectively communicates to such other person the intent to do so, but the other person continues the use or threat of unlawful, non-deadly force; or
The force involved was the product of a combat by agreement not authorized by law.
A person is justified in using deadly force upon another person:
When the person reasonably believes it necessary and reasonably believes such other person is:
About to use unlawful, deadly force against the person or a third party; or
Committing or about to commit a kidnapping, robbery or sexual assault against the person or a third party
However, a person is not justified in using deadly force if he or she provoked the encounter or knows that he or she or the third party can, with complete safety:
Retreat from the encounter (except that the person or the third party is not required to retreat if the person or the third party is in the person’s dwelling place and was not the initial aggressor);
Surrender property to the person; or
Comply with a demand that the person abstain from performing an act that the person is not obliged to perform.
Title 17-A, Pt. 1, Ch. 5, §104 and §108]
Use of Force in Defense of Premises
A person in possession or control of premises or a person who is licensed or privileged to be there is justified:
In using non-deadly force upon another person when and to the extent that the person reasonably believes it necessary to prevent or terminate the commission of a criminal trespass by such other person in or upon such premises.
In using deadly force upon another person when and to the extent that the person reasonably believes it necessary to prevent an attempt by the other person to commit arson.
In using deadly force upon another person when the person reasonably believes:
That such other person has entered or is attempting to enter a dwelling place or has surreptitiously remained within a dwelling place without a license or privilege to do so and is committing or is likely to commit some other crime within the dwelling place;
That deadly force is necessary to prevent the infliction of bodily injury by such other person upon the person or a third party present in the dwelling place; and
Only if the person first demands that the trespasser terminate the criminal trespass and the trespasser fails to immediately comply with the demand, unless the person reasonably believes that it would be dangerous to the person or a third person to make the demand.
“Dwelling place” means a structure that is adapted for overnight accommodation of persons or sections of any structure similarly adapted. A dwelling place does not include garages or other structures, whether adjacent or attached to the dwelling place, that are used solely for the storage of property or structures formerly used as dwelling places that are uninhabitable.
“Premises” includes, but is not limited to, lands, private ways and any buildings or structures thereon.
https://www.usconcealedcarry.com/resources/ccw_reciprocity_map/me-gun-laws/#