The National Rifle Association plans to sue the state of California if Gov. Jerry Brown signs a bill restricting the sale of some commonly used hunting rifles, raising the stakes as the deadline approaches for the governor’s decision.

The “worst of the worst” is SB 374, according to the NRA, which would change the definition of assault weapons to include any semi-automatic rifle with a detachable magazine or rifles with fixed or tubular magazines over 10 rounds.