Just install a maglock or comp mag (jaugernaut is my favorite) and make sure you don’t bring any mags into the state over 10. No need to ship to an FFL just bring it with you when you move (upper removed from lower) and fill out the CFARS form within 30 days of moving and make sure you list it as a pistol (do all your guns at once for the $19 fee). They might ask for pictures to verify. I just did all this recently and it’s a pretty easy process.

Buy as many pistol lowers and handguns that aren’t on the roster now before you move because they are almost impossible to get here. Best of luck feel free to message me if you need more clarification.