(a) General rule.—No county, municipality or township may in any manner regulate the lawful ownership, possession, transfer or transportation of firearms, ammunition or ammunition components when carried or transported for purposes not prohibited by the laws of this Commonwealth.

(b) Definition.—For the purposes of this section, the term "firearms" has the meaning given in section 5515 (relating to prohibiting of paramilitary training) but shall not include "air rifles" as defined in section 6304 (relating to sale and use of air rifles).