Imposes gross receipts tax on firearms and firearms ammunition.

S 2306 would impose a 2.5% tax on retail sales of firearms and a 10% tax on retail sales of firearms ammunition within New Jersey, directly affecting retailers who sell these items in the state. The tax applies only to sales made within New Jersey, excluding sales to government agencies (federal, state, or local) or deliveries outside the state. Retailers would collect the tax and pay it monthly to the Division of Taxation, with the tax taking effect 30 days after enactment for sales starting in the first full calendar quarter after that date. The bill defines "firearms" as weapons expelling projectiles via combustion and "firearms ammunition" as cartridges, shells, and related components.