Sale, Transfer, and Storage of Firearms; Revising the standard by which adults and minors are considered criminally negligent in the storage of a firearm under specified circumstances; providing criminal penalties; revising an exception to the prohibition on storing or leaving a loaded firearm within the reach or easy access of a minor who obtains it and commits a specified violation; revising requirements for the safe storage of loaded firearms; providing criminal penalties if a person is found to have failed to properly secure or store a firearm, resulting in a minor gaining access to the weapon, etc.