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As long as the gun is legal to own in my country, PRK, can I purchase from a gun show out of state and transfer it here? Thanks
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In the other 49, a2car's information is correct. Cali, however, requires all firearms transactions (even those made between private persons with no dealer's licenses) to be processed by a Cali licensed FFL.
An out-of-state dealer cannot run a CalDOJ check or provide you with a Cali DROS, so I don't believe you're allowed to purchase ANY firearm outside of California. You can obviously purchase the firearm, have it transferred to a Cali FFL, and do the transfer in that manner.
If you lived in almost any other state, you could purchase a long gun (rifle or shotgun), in-person, at a licensed dealer's premises or from a licensed dealer at an organized gunshow in another state. Some states still only allow out-of-state long gun purchases in states directly adjoining their borders.