What constitutes a "restricted firearm" in California?

In California, a "restricted firearm" is defined as firearms that are illegal to own or require special permits to possess. This classification includes certain types of firearms that are considered too dangerous for public ownership, such as assault weapons and .50 BMG rifles. The state has specific laws that regulate the types of firearms that can be legally owned, and individuals wishing to possess restricted firearms must go through a rigorous permitting process to ensure they meet all legal requirements.

The other options do not accurately represent the concept of restricted firearms. Firearms available for public purchase are typically those that do not fall under any restricted category. Similarly, firearms classified as antiques generally have different regulations and are often exempt from certain restrictions that apply to modern firearms. The idea that all firearms are considered restricted is also incorrect, as many firearms can be legally purchased and owned without special permits or restrictions.