Gun law in the United States is defined by a number of state and federal statutes.  Sale or delivery of firearms is restricted in Maine like any other U.S. state.  In almost all the states of the US, an importer, manufacturer, dealer or collector shall be licensed under the federal Gun Control Act of 1968 to be a lawful seller.

In the state of Maine, any commercial retail sales outlet that sells firearms shall conspicuously post at each purchase counter where firearms may be purchased the following warning in block letters not less than one inch in height: “ENDANGERING THE WELFARE OF A CHILD IS A CRIME. IF YOU LEAVE A FIREARM AND AMMUNITION WITHIN EASY ACCESS OF A CHILD, YOU MAY BE SUBJECT TO FINE, IMPRISONMENT OR BOTH. KEEP FIREARMS AND AMMUNITION SEPARATE. KEEP FIREARMS AND AMMUNITION LOCKED UP. USE TRIGGER LOCKS.” Warning must be posted at all entrances of an organized gun show.  Any person, who fails to post the warning in compliance, commits a civil violation for which a civil forfeiture of not more than $ 200 may be adjudged. To Sell, let or loan a firearm to a person without making a copy of the form a dealer must keep a record for the same.  The copy must be made and marked as “STATE COPY” before the firearm is delivered.  A person who violates this subsection commits a civil violation for which a fine of $ 50 may be adjudged.  This does not apply to a wholesaler who sells only to other dealers or to a manufacturer who sells only at wholesale[i].

[i] 15 M.R.S. § 455