To my understanding, .50BMG is not allowed in CA by citizens. Barret Intl refused to sell or market .50 rifles & weapons to any CA law enforcement or public safety.
Numerous agencies in CA has these BEFORE Barrett stopped selling to or servicing from those agencies, however.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011