Law for handgun transfers in 2020 is
2 parties, dealer and you - 1-in 30 applies
3 parties - seller, you and dealer because CA says so - 1-in-30 does NOT apply, except at FFLs inside the city of Los Angeles. City of LA has its own law.
Note there is no mention of new/used.
3 parties - seller, you and dealer because CA says so - 1-in-30 does NOT apply, except at FFLs inside the city of Los Angeles. City of LA has its own law.

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