Sale, Transfer, or Storage of Firearms; Revises standard for adults & minors to be considered criminally negligent in storage of firearm; redefining term "minor"; revises exception to prohibition on storing or leaving loaded firearm within reach or easy access of minor who obtains it & commits specified violation; revises requirements for safe storage of loaded firearms; provides criminal penalties if person fails to properly secure or store firearm & minor gains access to weapon as result; requires seller or transferor of firearm to provide each purchaser or transferee with specified information; provides immunity for certain providers of information.