IIRC, only a handgun may not be sold across state lines without a FFL transfer done. A long gun may or may not be legal to do so. Consult a lawyer for factual knowledge, trusting data from internet chat isn't advisable.
I'd just like to say hi to all the ATF employees that have dropped in to check us out.
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It's the other way around.
Handguns - no private transfer across state lines (I know)
longguns - private transfer OK (I think)
What if you own 2 houses in two different states? Which state can you buy guns in?does it go off the state you pay taxes in, or the one you have a drivers license for, or do you just need a deed or mortgage paperwork to prove residence. Or will an electricity bill do, (for the people who don't drive, and rent a place to live)
What is required in a LA to LA person to person sale for both?
This is correct.
The state you have residency in.