(a) No city or county shall adopt or enforce any ordinance, resolution or regulation, and no agent of any city or county shall take any administrative action, governing the requirement of fees, licenses or permits for, the commerce in or the sale, purchase, transfer, ownership, storage, carrying, transporting or taxation of firearms or ammunition, or any component or combination thereof.

(b) Any ordinance, resolution or regulation prohibited by subsection (a) that was adopted prior to July 1, 2015, shall be null and void.

(c) Nothing in this section shall:

(1) Prohibit a city or county from adopting and enforcing any ordinance, resolution or regulation relating to the personnel policies of such city or county and the carrying of firearms by employees of such city or county, except that any such ordinance, resolution or regulation shall comply with the provisions of Kan. Stat. Ann. § 75-7c01 et seq., and amendments thereto;

(2) prohibit a city or county from adopting any ordinance, resolution or regulation pursuant to Kan. Stat. Ann. § 75-7c20, and amendments thereto;

(3) prohibit a law enforcement officer, as defined in Kan. Stat. Ann. § 22-2202, and amendments thereto, from acting within the scope of such officer’s duties; or

(4) prohibit a city or county from levying and collecting any retailers’ sales tax on the sale of firearms, ammunition or any component or combination thereof as authorized by Kan. Stat. Ann. § 12-189, and amendments thereto.