SB 778 - This act lists various declarations of the Missouri General Assembly regarding the United States Constitution and the scope of the federal government's authority. In addition, the act declares that federal supremacy does not apply to federal laws that restrict or prohibit the manufacture, ownership, and use of firearms, firearm accessories, or ammunition within the state because such laws exceed the scope of the federal government's authority. Laws necessary for the regulation of the land and the United States Armed Forces are excluded from the types of federal firearms laws that exceed federal authority. This act also declares that the General Assembly strongly promotes responsible gun ownership and condemns unlawful transfers of firearms and the use of a firearm in criminal or unlawful activity. This act declares as invalid all federal laws that infringe on the right to bear arms under the Second Amendment to the U.S. Constitution and Article I, Section 23 of the Missouri Constitution. Some laws declared invalid under this act include certain taxes, certain registration and tracking laws, certain prohibitions on the possession, ownership, use, or transfer of a specific type of firearm, and confiscation orders. The act declares that it is the duty of the courts and law enforcement agencies to protect the rights of law-abiding citizens to keep and bear arms. Under this act, no public officer or state employee has the authority to enforce firearms laws declared invalid by the act. Any person who acts under the color of law to deprive a Missouri citizen of rights or privileges ensured by the federal and state constitutions shall be liable for redress. In such an action attorney's fees and costs may be awarded, and official or qualified immunity shall not be available to the defendant as a defense. It is a Class A misdemeanor under this act for a federal employee to enforce or attempt to enforce firearms laws declared invalid by the act. State law enforcement officers are provided the power to interpose on behalf of law-abiding citizens. The provisions of this act shall become effective either by August 28, 2017, or upon the Revisor of Statutes receiving notification that at least four other states have enacted substantially similar language or upon passage of any federal acts or issuance of federal orders which infringe upon or curtail the right to keep and bear arms, whichever event occurs earlier. These provisions are similar to provisions of SS/SCS/SB 613 (2014), CCS/SS/SCS/HCS/HB 1439 (2014), HB 436 (2013), and SB 352 (2013). MEGHAN LUECKE